Abstract
Canine rabies is endemic and occurs throughout the year in all parts of Nigeria. A descriptive cross sectional study was designed to assess knowledge, attitude and practice of dog owners towards rabies, to check for the presence of rabies antigens in brain tissue of dogs slaughtered for human consumption and to assess rabies vaccination coverage of dogs in Wukari. Structured questionnaires were prepared and administered to 200 dog owners by face to face interview. The questionnaire sought information on demographic characteristics of the dog owners, their association with dogs, knowledge, attitude and practice of dog owners towards rabies. Associations between demographic variables and knowledge, attitude or practice scores were assessed using χ2 analysis. Also, 188 brain samples from slaughtered dogs were analysed for presence of rabies antigen using direct fluorescent antibody test. Fifteen (7.89%) had rabies antigen. Record files and vaccination certificates of dogs presented to the State Veterinary Hospital Wukari were assessed for anti rabies vaccination coverage. Out of the 200 dog owners, only 26 (13%) knew that rabies virus can be found in nervous tissue, 121 (60.5%) were aware that rabies can be spread through the saliva of a rabid animal, but majority of respondents 172 (86%) did not know the age for first vaccination of dogs against rabies. Dog owners who were civil servants were 4.8 times more likely to have good knowledge (OR=4.84, 95% CI on OR 1.09-21.44) than those of other occupation groups. Positive attitude towards rabies increased with increase in age of dog owners, with respondents within the age group 20-30 years more likely to have negative attitude than those over 40 years. Civil servants were 9.8 times more likely to have good practice than other occupation groups. Rabies antigen was detected in 7.98% of slaughtered dogs. Out of 8370 dogs presented to the hospital between January 2003 and December 2012, only 1128 (13.50%) received anti rabies vaccine. Inadequate knowledge of some aspects of rabies, negative attitude and practice of dog owners towards rabies, the presence of rabies antigen in some dogs slaughtered for human consumption and low vaccination coverage in dogs are indicative of high risk of exposure of dog owners and dog meat processors to rabies. There is therefore a need for educational programmes targeted at dog owners to increase their level of knowledge and reduce the risk of exposure to rabies.
Keywords: knowledge, attitude, practice, rabies, vaccination, dog owners
1. Introduction
Rabies is a viral disease of all warm blooded animals, which causes acute fatal encephalitis, with almost 100% case fatality rate. This disease occurs in more than 150 countries and territories and about 55 000 people die of rabies every year, mostly in Africa, Asia, and South America (Beard, 2001; WHO, 2006) even though it is a vaccine preventable disease. Forty percent of people who are bitten by suspected rabid animals are children under 15 years of age and dogs are the source of 99% of human rabies deaths (WHO, 2010). Every year, more than 15 million people worldwide receive a post-exposure preventive regimen to avert the disease; this is estimated to prevent 327 000 rabies deaths annually (WHO, 2010).
The disease is endemic in developing countries including Nigeria and other parts of sub-Saharan Africa and Asia (Harry et al., 1984; WHO, 2005) and is often misdiagnosed, under-diagnosed and underreported (Adedeji et al., 2010; Ehizibolo et al., 2011). In Nigeria, the disease was first reported in 1912 in humans, but the first laboratory confirmation was in 1925, by demonstration of Negri bodies in the brain smear of a mad dog (Ekele & Okoh, 1984) and has been declared endemic in Nigeria by several authors (Umoh & Belino, 1979; Fagbami et al., 1981).
Inapparent infection and recovery from clinical disease with resultant persistent or intermittent shedding of rabies virus have affected the overall effort in rabies eradication and control in most parts of the world (Ajayi et al., 2006, Nishizono et al., 2008; WHO, 2005). In Nigeria, rabies infections both in animals and humans are grossly under reported (Fagbami et al., 1981) and reliable data on rabies are scarce in many parts of the world, making it difficult to assess its impact on human and animal health (WHO, 2005). Dog meat is consumed by various ethnic groups in Nigeria. Dog slaughter points are particularly common in Plateau, Cross river, Akwa Ibom, Taraba and Gombe (Simoons, 1994), Kaduna, Kebbi and Ondo (Okonko et al., 2010) and in Abia State (Mshelbwala et al., 2013). Little or no information is available on the epidemiology of rabies in Wukari metropolis even though there is an obvious presence of dogs and dog meat is consumed here. Many dog meat processors and dog owners may not know about the devastating effects of rabies in humans and the potential risk of handling dogs. They may engage in some practices that may therefore expose them to the disease.
Studies on knowledge, attitude and practice (KAP) towards rabies among dog meat processors and dog meat consumers have been carried out in different parts of the country (Opaleye et al., 2006; Isek, 2013; Odeh et al., 2014) and these have shown that KAP is an important factor in the control of rabies in Nigeria.
Vaccination against rabies virus is a highly effective method of preventing the disease in humans and animals (Jakel et al., 2008). Dog rabies control relies on mass vaccination of dogs in order to achieve population immunity levels sufficient to inhibit rabies transmission (Perry & Wandeler, 1993). Mass vaccination has been used successfully in Western Europe and North America (Wandeler, 2000; WHO, 2004), showing that the disease can be controlled and eliminated by vaccination of reservoir animal population. In Nigeria, it has not been possible to successfully control rabies, instead evidences show that the disease is on the increase (Ogunkoya, 1997).
This study was carried out to assess the risk of exposure to rabies by assessing the rabies related knowledge, attitudes and practices of dog owners, checking for evidence of rabies infection in slaughtered dogs and assessing rabies vaccination coverage in dogs in Wukari, Taraba State, Nigeria.
2. Material and Methods
2.1 Study Area and Population
This study was carried out in Wukari metropolis of Taraba State, Nigeria. Wukari metropolis is a large town and is the Headquarters of Wukari Local Government Area of Taraba State. The rivers Donga and Benue pass through this area. It shares boundary with Benue State to the south. Geographically, it lies between latitude 7° 53’ 42” North and longitude 9° 47’ 59” East. It is one of the major towns in Taraba State and has an area of 4,308 km² and a population of 241,546 at the 2006 census. It has a State Veterinary Hospital, a General Hospital and other private clinics. The major tribes in the area are Jukun, Kutep, Tiv, Hausa and the Fulani, but Hausa and English are most commonly spoken by all residents.
2.2 Study Design and Data Collection
Cross sectional study was carried to assess knowledge, attitude and practice of dog owners and detection of rabies antigen in the brain tissue of dogs slaughtered for human consumption between June to September 2013 in Wukari metropolis, Taraba State, Nigeria. While a descriptive epidemiology was used to assess dog vaccination records in the State Veterinary Hospital Wukari, from January 2003 to December 2012.
2.3 Survey Methods
Structured questionnaire was designed then pre- tested employing face to face interview to 10 dog owners within the study area. The questionnaires were analysed and re-evaluated for questions that weren’t clear to the respondents, after wards 200 of the modified questionnaire were distributed to dog owners between June - September 2013. Forty (40) streets, consisting of eight (8) streets in each of the 5 major residential areas (Anguwan dujukun, Filin jirgi, GRA, Pawzu and New Jerusalem) within the study area were surveyed. A total of 200 dog households were surveyed. Starting from the 1st major street of each area, every 2nd street was surveyed using systematic random sampling. In each chosen street, starting from the 1st house, every 2nd house was selected, and an adult member in each household was interviewed using questionnaire. The questionnaire was made up of five (5) sections. The demographic information of respondents was contained in section A. Information on association of respondent with dogs was contained in section B, this had questions on number of dogs owned, period of dog keeping and reasons for keeping dogs. Section C contained information about knowledge of rabies, which included questions on mode of transmission, clinical signs/symptoms and preventive measures. Questions on attitude of respondents towards rabies were provided in section D. Section E contained questions on practice of the respondents towards rabies. The questionnaire was explained to the respondents by the researcher and their responses were recorded. The questionnaires were administered by oral interview only to dog owners who were present and willing to participate at the time of study. The options for the choice questions were “Yes”,” No” and “Don’t know/Undecided”. A marking scheme containing expected correct answers was prepared and used to mark and score the responses. Don’t know/undecided responses were considered as wrong answers. For each correct and incorrect answer, one and zero points were assigned. Houses without dogs or houses that refused to participate in the compound questionnaire survey were skipped for the next houses possessing dog(s). A total of five (5) houses were surveyed in each street chosen.
2.4 Detection of Rabies Antigen
One hundred and eighty eight (188) dog heads were purchased from dog meat processors at slaughter points. The brain was removed from each dog head as described by Atanasiu (1975), placed in clean sample bottles and preserved at -20 °C. The samples were then transported on ice packs to the Viral Zoonoses Laboratory of The Department of Veterinary Public Health and Preventive Medicine, Ahmadu Bello University, Zaria, Nigeria. Direct Fluorescent Antibody test (DFA) as described by Dean et al., (1996) was performed on the brain samples collected.
2.5 Vaccination Records
Information on age, sex and breed of dogs were collected monthly for the ten year period (2003-2012). Results obtained were presented using tables and charts.
2.6 Statistical Analysis
Data obtained was entered into a computer and analyzed using Statistical Package for Social Sciences, SPSS (Version 17, SPSS Inc. Chicago IL USA). Demographic variables were presented using descriptive statistics. The mean knowledge, attitude and practice scores were calculated. Respondents with knowledge, attitude and practice scores equal or greater than the mean scores were considered to have good knowledge, attitude and practice while those who had scores below the mean were categorized as having poor knowledge, attitude and practice. Associations between demographic variables and the categorized scores were assessed using χ2 test of association and odds ratio; confidence intervals (95%) were calculated for odds ratios. Values of p<0.05 were considered significant in the χ2 analysis. Relationships between non-categorized scores were assessed using multiple regression analysis. Brain samples positive for rabies antigen were expressed as a percentage of the total sample examined. Time series decomposition using ratio to moving average was used to assess seasonal variation in dog vaccination. Time series decomposition using ratio to moving average was used to assess seasonal variation in dog vaccination.
3. Results
3.1 Demographic Characteristics of the Respondents and Association with Dogs
Out of the 200 respondents that participated in the study, 101 (50.5%) were males. Respondents between the age group 20-30 years were 59 (29.5%) while respondents between were 31-40 years 55 (27.5%). 61 (30.1%) of the respondents were civil servants while 86 (43.0%) were self employed. Based on level of education of respondents, 29 (14.5%) had no formal education while 71 (35.5%) had tertiary education. Majority of respondents 125 (62.5%) were of the Jukun tribe (Table 1).
Table 1.
Demographic characteristics of respondents in Wukari, Taraba State Nigeria
| Characteristics | Total number of respondents N=200 | Specific rates (%) |
|---|---|---|
| Gender | ||
| Male | 101 | 50.5 |
| Female | 99 | 49.5 |
| Age (years) | ||
| <19 | 36 | 18.0 |
| 20-30 | 59 | 29.5 |
| 31-40 | 55 | 27.5 |
| >40 | 50 | 25.0 |
| Marital status | ||
| Single | 67 | 33.5 |
| Married | 133 | 66.5 |
| Occupation | ||
| Unemployed | 11 | 5.5 |
| Civil servant | 61 | 30.5 |
| Self employed | 86 | 43.0 |
| Student | 42 | 21.0 |
| Educational level | ||
| No formal education | 29 | 14.5 |
| Primary | 42 | 21.0 |
| Secondary | 58 | 29.0 |
| Tertiary | 71 | 35.5 |
3.2 Association with Dogs
Out of the 200 households visited, a total of 399 dogs were owned by the respondents, with a ratio of approximately 2 dogs per household. Majority of the respondents 190 (95%) kept dogs for protection. Only 23 (11.5%) had specially constructed cages for their dogs and 160 (80%) let their dogs roam freely within the neighborhood. Respondents who reported that they had been previously bitten by a dog were 43 (21.5%) (Table 2).
Table 2.
Associations of dog owners with dogs in Wukari Taraba State Nigeria
| Association item | Total number of respondents N=200 | Specific rates (%) |
|---|---|---|
| Number of dogs owned | ||
| One | 68 | 34.0 |
| Two | 90 | 45.0 |
| Three | 29 | 14.5 |
| >three | 13 | 6.5 |
| Reason for keeping dogs | ||
| Protection | 190 | 95.0 |
| Companionship | 8 | 4.0 |
| Hunting | 2 | 1.0 |
| Period of dog keeping (years) | ||
| 1-5 | 47 | 23.5 |
| 6-10 | 40 | 20.0 |
| 11-15 | 88 | 44.0 |
| >15 | 25 | 12.5 |
| Dog housing | ||
| Specially constructed cages | 23 | 11.5 |
| Anywhere on the premises | 177 | 88.5 |
| Control of dog movement | ||
| Never allowed to leave the premises | 40 | 20.0 |
| Allowed to roam freely in the neighborhood | 160 | 80.0 |
| Have you been bitten by a dog | ||
| Yes | 43 | 21.5 |
| No | 157 | 78.5 |
3.3 Knowledge of Rabies
The mean knowledge score of respondents was 14.30 out of 20 items scored. Majority 171 (85.5%) agreed that rabies does not kill only animals, 26 (13%) knew that the rabies virus can be found in the nervous tissue, 121 (60.5%) agreed that rabies can be spread through the saliva of a rabid animal and 163 (81.5%) agreed that dogs are the possible common source of rabies in Nigeria. One hundred and fifty-nine (71.5%) affirmed that humans can be infected with rabies, but majority of respondents 172 (86%) did not know the age when dogs receive their first dose of anti-rabies vaccine (Table 3). The results show statistical significant association between occupation and knowledge (Table 4), with civil servants 4.8 times more likely to have good knowledge (OR=4.84, 95% CI on OR 1.09-21.44) than other occupation groups (Table 5).
Table 3.
Assessment of knowledge of the respondents on rabies in Wukari, Taraba State
| Knowledge item N=200 | Frequency | (%) |
|---|---|---|
| Rabies kills only animals | ||
| Yes | 29 | 14.5 |
| No | 171 | 85.5 |
| Rabies virus can be found in the nerves | ||
| Yes | 26 | 13.0 |
| No | 174 | 87.0 |
| The virus can be spread through the saliva of a rabid animal | ||
| Yes | 121 | 60.5 |
| No | 79 | 39.5 |
| Dogs are common source of rabies in Nigeria | ||
| Yes | 163 | 81.5 |
| No | 37 | 18.5 |
| Humans can be infected with rabies | ||
| Yes | 159 | 79.5 |
| No | 41 | 20.5 |
| At what age should dogs receive first dose of rabies vaccine? | ||
| 3 months | 28 | 14.0 |
| 9 months | 172 | 86.0 |
| Dog meat processors are at more risk of being infected with rabies virus | ||
| Yes | 54 | 27.0 |
| No | 146 | 73.0 |
| A mad dog should not be slaughtered for human consumption | ||
| Yes | 162 | 81.0 |
| No | 38 | 19.0 |
| Dog registration and licensing helps in control of rabies | ||
| Yes | 101 | 50.5 |
| No | 99 | 49.5 |
| Vaccination of dogs against rabies should be repeated yearly | ||
| Yes | 114 | 57.0 |
| No | 86 | 43.0 |
Table 4.
Association of demographic variables of respondents with categorized knowledge scores of rabies in Wukari, Taraba State
| Categorized scores N=200 | |||||
|---|---|---|---|---|---|
| Variables | Poor | Good | χ2 | (df) | p-value |
| Age (years) | |||||
| <19 | 25(69.4) | 11(30.6) | |||
| 20-30 | 28(47.5) | 31(52.5) | 5.384 | 3 | 0.146 |
| 31-40 | 27(49.1) | 28(50.9) | |||
| >40 | 24(48.0) | 26(52.0) | |||
| Gender | |||||
| Male | 46(45.5) | 55(54.5) | 3.407 | 1 | 0.65 |
| Female | 58(58.6) | 41(41.4) | |||
| Marital status | |||||
| Single | 40(59.7) | 27(40.3) | 2.394 | 1 | 0.122 |
| Married | 64(48.1) | 69(51.9) | |||
| Occupation | |||||
| Unemployed | 9(81.8) | 2(18.2) | |||
| Civil servant | 15(24.6) | 46(75.4) | 29.304 | 3 | 0.000 |
| Self employed | 50(58.8) | 35(41.2) | |||
| Student | 30(69.8) | 13(30.2) | |||
| Educational level | |||||
| No formal education | 19(65.5) | 10(34.5) | |||
| Primary | 25(59.5) | 17(40.5) | 29.313 | 3 | 0.000 |
| Secondary | 41(70.7) | 17(29.3) | |||
| Tertiary | 19(26.8) | 52(73.2) | |||
* Percentages in parentheses and numbers in front.
Table 5.
Multivariable logistic regression analysis of demographic variables and categorized knowledge scores of respondents in Wukari, Taraba State, Nigeria
| Variables N=200 | Categorized scores N=200 | ||||
|---|---|---|---|---|---|
| Poor | Good | Crude odds ratio (95% CI) | Adjusted odds ratio (95% CI) Poor | Adjusted odds ratio (95% CI) Good | |
| Age (years) | |||||
| <19 | 25(69.4) | 11(30.6) | 2.46(1.00-6.09) | 0.32(0.07-1.54) | 3.09(0.65-14.76) |
| 20-30 | 28(47.5) | 31(52.5) | 0.98(0.46-2.08) | 0.42(0.17-1.07) | 2.36(0.93-5.97) |
| 31-40 | 27(49.1) | 28(50.9) | 1.04(0.49-2.25) | 0.84(0.36-1.98) | 1.19(0.50-2.82) |
| >40 | 24(48.0) | 26(52.0) | 1 | 1 | 1 |
| Gender | |||||
| Male | 46(45.5)) | 55(54.5)) | 0.59(0.34-1.03) | ||
| Female | 58(58.6) | 41(41.4) | 1 | ||
| Marital status | |||||
| Single | 40(59.7) | 27(40.3) | 1.60(0.88-2.90) | ||
| Married | 64(48.1) | 69(51.9) | 1 | ||
| Occupation | |||||
| Unemployed | 9(81.8) | 2(18.2) | 1.95(0.37-10.30) | 1.40(0.21-9.39) | 0.72(0.11-4.81) |
| Civil servant | 15(24.6) | 46(75.4) | 0.14(0.06-0.34) | 0.21(0.05-0.91) | 4.84(1.09-21.44) |
| Self employed | 50(58.8) | 35(41.2) | 0.62(0.28-1.35) | 0.27(0.08-0.99) | 3.65(1.02-13.12) |
| Student | 30(69.8) | 13(30.2) | 1 | 1 | 1 |
| Educational level | |||||
| No formal education | 19(65.5) | 10(34.5) | 5.20(2.05-13.16) | 4.49(0.94-21.57) | 0.22(0.46-1.07) |
| Primary | 25(59.5) | 17(40.5) | 4.02(1.79-9.05) | 4.11(0.90-18.84) | 0.24(0.53-1.12) |
| Secondary | 41(70.7) | 17(29.3) | 6.60(3.05-14.28) | 4.52(0.95-21.54) | 0.22(0.46-1.05) |
| Tertiary | 19(26.8) | 52(73.2) | 1 | 1 | 1 |
3.4 Attitudes towards Rabies
The mean attitude score was 6.45 out of 9 items, indicating that the respondents had moderately positive attitude towards the disease. Most of the respondents 113 (56.5%) were of the opinion that children should not be allowed to play with dogs, while majority 195 (97.5%) affirmed that they do not play with unknown dogs. Categorized attitude scores showed an association with age, occupation and educational qualification of respondents (χ2 = 10.996, df=3, p=0.012, χ2 =28.184, df=3, p=0.000 and χ2=37.816, df=3, p=0,000 respectively) (Table 6).
Table 6.
Summary of demographic variables with categorized attitude scores of dog owners in Wukari, Taraba State, Nigeria
| Variable | Negative attitude N= 200 | Positive attitude | χ2 | Df | P-value |
|---|---|---|---|---|---|
| Age (years) | |||||
| <19 | 11(30.5) | 25(69.5) | |||
| 20-30 | 30(50.8) | 29(49.2) | 10.996 | 3 | 0.012 |
| 31-40 | 17(30.9) | 38(69.1) | |||
| >40 | 11(22.0) | 39(78.0) | |||
| Gender | |||||
| Male | 36(35.6) | 65(64.4) | 0.118 | 1 | 0.731 |
| Female | 33(33.3) | 66(66.7) | |||
| Marital status | |||||
| Single | 25(37.3) | 42(62.7) | 0.353 | 1 | 0.553 |
| Married | 44(38.9) | 89(61.1) | |||
| Occupation | |||||
| Unemployed | 6(54.5) | 5(45.5) | |||
| Civil servant | 6(9.8) | 55(90.2) | 28.184 | 3 | 0.000 |
| Self employed | 43(50.6) | 42(49.4) | |||
| Student | 14(32.6) | 29(67.4) | |||
| Educational level | |||||
| No formal education | 18(62.0) | 11(38.0) | |||
| Primary | 26(61.9) | 16(38.1) | 37.816 | 3 | 0.000 |
| Secondary | 14(24.1) | 44(75.9) | |||
| Tertiary | 11(15.5) | 60(84.5) | |||
* Percentages in parentheses and numbers in front.
3.5 Practices towards Rabies
Most of the respondents 151 (75.5%) advised that dog handlers should take human anti-rabies vaccine (Table 7). There was statistical significance between the occupation and categorized practice scores of respondent, with civil servants and those who were self employed having higher practice scores (χ2=9.983, df=3, p=0.019) than students (Table 8).
Table 7.
Assessment of practice of respondents towards rabies in Wukari, Taraba State Nigeria
| Practice items N=200 | Frequency (%) |
|---|---|
| It is good to vaccinate your dog | |
| Yes | 172(86.0) |
| No | 28(14.0) |
| Dog handlers should wear protective clothing | |
| Yes | 167(83.5) |
| No | 33(16.5) |
| It is good to wash dog bite wounds with soap | |
| Yes | 182(91.0) |
| No | 18(9.0) |
| Dog handlers should take human anti-rabies vaccine | |
| Yes | 151(75.5) |
| No | 49(24.5) |
* Percentages in parentheses and numbers in front.
Table 8.
Association of demographic variables of dog owners with categorized practice scores in Wukari, Taraba State Nigeria
| Variables | Poor Practice N=200 | Good Practice | χ2 | Df | P-value |
|---|---|---|---|---|---|
| Age (years) | |||||
| <19 | 16(44.4) | 20(55.6) | |||
| 20-30 | 23(39.0) | 36(61.0) | 4.965 | 3 | 0.174 |
| 31-40 | 30(54.5) | 25(45.5) | |||
| >40 | 29(50.0) | 21(42.0) | |||
| Gender | |||||
| Male | 48(47.5) | 53(52.2) | 0.178 | 1 | 0.673 |
| Female | 50(50.5) | 49(49.5) | |||
| Marital status | |||||
| Single | 31(46.3) | 36(53.7) | 0.301 | 1 | 0.583 |
| Married | 67(50.4) | 66(49.6) | |||
| Occupation | |||||
| Unemployed | 7(63.6) | 4(36.4) | |||
| Civil servant | 20(32.8) | 41(67.2) | 9.983 | 3 | 0.019 |
| Self employed | 49(57.6) | 36(42.4) | |||
| Student | 22(51.2) | 21(48.8) | |||
| Educational level | |||||
| No formal education | 19(65.5) | 10(34.5) | |||
| Primary | 20(47.6) | 22(52.4) | 7.502 | 3 | 0.057 |
| Secondary | 32(55.2) | 26(44.8) | |||
| Tertiary | 27(38.0) | 44(62.0) | |||
* Percentages in parentheses and numbers in front.
3.6 Detection of Rabies Antigen
Out of the 188 brain samples examined, 15 (7.98%) were positive for rabies antigen. The rate of infection was higher in younger dogs (9, 4.79%) than in older dogs (6, 3.19%). Also, male dogs had higher infection rate 9 (4.79%) than the female dogs 6 (3.19%) (Table 9).
Table 9.
Sex and age distribution of dogs slaughtered for human consumption in Wukari whose brain tissue samples tested positive for rabies antigen
| Gender | Age* | No. Tested (%) | No. Positive Sex specific rates (%) | |
| 1-24months | >24months | |||
| Male | 4/32 | 5/88 | 120(63.83) | 9(4.79) |
| Female | 5/25 | 1/43 | 68(36.17) | 6(3.19) |
| Total (%) | 9/57 | 6/131 | 188(100) | 15(7.98) |
Number positive/Number tested
3.7 Vaccination Coverage
A total of 8,370 dog cases were presented to the hospital between January 2003 and December 2012. One thousand one hundred and twenty eight dogs (13.50%) received anti rabies vaccine within this period, 589 (52.2%) males and 539 (47.8%) females. Most of the dogs vaccinated were within 3-12 months of age 664 (58.9%). Indigenous breeds of dog had the highest vaccination coverage 921 (81.6) compared with exotic breeds and crosses (Table 10). There was an increase in vaccination rates of dogs in the years 2005, 2009, 2010, 2011 and 2012 (Figure 1) as compared with other years. Seasonal index of vaccination of dogs within Wukari peaked in the month of March (Figure 2).
Table 10.
Sex, breed and age distribution of dogs vaccinated against rabies in State Veterinary Hospital Wukari, Taraba State
| Gender | No. of dogs vaccinated | Percentage (%) |
|---|---|---|
| Male | 589 | 52.2 |
| Female | 539 | 47.8 |
| Breed | ||
| Indigenous | 921 | 81.6 |
| Exotic | 76 | 6.7 |
| Cross | 131 | 11.6 |
| Age | ||
| 3-12months | 664 | 58.9 |
| 12-36 | 385 | 34.1 |
| >36 | 79 | 7.0 |
| Total | 1128 | 100 |
Figure 1.
Annual distribution of number of dogs vaccinated against rabies in Wukari from 2003-2012
Figure 2.
Seasonal variation of vaccinated dogs in Wukari, Taraba State, Nigeria (2003-2012)
4. Discussion
Dog owners in this study showed an acceptable level of knowledge on mode of transmission of rabies, clinical signs of the disease and effects of licensing and registration of dog, but had poor knowledge of age of first vaccination of dogs, with a mean knowledge score of 14.30. Most of the respondents did not agree that dog meat processors were at risk of being exposed to the disease. There was statistical significant association between occupation, educational level and level of knowledge of respondents, with civil servants and those with secondary and tertiary education having higher knowledge scores. This may be because they have higher educational background than those in other occupational categories in this study. The findings agree with study done by Isek (2013). Age of respondents also had an effect on the level of knowledge. Dog owners within the age group 20-30 were more likely to have poor knowledge of the disease than older respondents.
Respondents’ attitude of not playing with unknown sick dogs, not allowing stray dogs to roam freely in their compounds, seeking medical assistance if bitten by a dog and not allowing children play with dogs are good signs of the people’s involvement in the control of rabies. Positive attitude of respondents towards the control of rabies increased with age.
Practices of good vaccination of dogs, advising dog handlers to wear protective clothing and take human anti-rabies vaccine and washing of dog bite wounds with soap and water are also indicators that the community is involved in the control of the disease. Poor practices of using traditional medicine and non-washing of dog bite wounds goes against the WHO recommendation of instituting medical treatment on victims of dog bite. These negative practices may be as a result of inadequate awareness of the possible dangers of rabies. Individuals involved in the handling and processing of dog meat are constantly being exposed to rabies virus through bites from dogs, cuts or wounds that are not well protected from infective tissue or saliva of these dogs, thereby constituting a great risk of rabies exposure. Presence of antigens to rabies in brain of dogs slaughtered for human consumption is very significant in the epidemiology of the disease. This means that dog meat processors and handlers are at risk of being exposed to rabies either from bites from dogs before slaughter or by coming in contact with infective tissue or saliva. This agrees with previous studies carried out in different locations in Nigeria (Garba et al., 2008; Akombo, 2009; Aliyu et al., 2010; Isek, 2013). Result of this study shows that more male dogs and younger dogs (1-24 months) were positive for rabies than the females and older dogs. This may be because more male dogs were presented for slaughter than female dogs at the time of this study. This disagrees with the study carried out by Baba (2006), Aliyu et al. (2010) and Isek (2013) which showed that more adult dogs tested positive for rabies antigen compared to younger dogs.
The vaccination profile indicates that indigenous breed of dogs had higher vaccination coverage (81.6%) than exotic breeds and crosses. This can be attributed to the high population of indigenous breeds in the area compared to exotic breeds and crosses which are more expensive to acquire and maintain. This is in agreement with the study carried out by Isek (Isek, 2013) Dogs within the age group 3-12 months had the highest vaccination coverage (58.9%), compared to older dogs. this may be due to frequent advice to dog owners to vaccinate their dogs from 3 months of age and above. Dogs less than 6 months are very important in transmission of rabies in humans and are more likely to be accessible for parenteral vaccination than older dogs (Mitmoonpitak et al., 1998). The increase in number of dogs vaccinated in recent years (2009-2012) (Figure 1) may be as a result of increased awareness of dog owners on the need to vaccinate their dogs and the possible dangers of rabies to humans and animals. The peak in dog vaccination in March (Figure 2), this might be connected to findings in studies carried out by Owai (2009), Umoh and Belino (1979) and Tomori (1980) who reported that most outbreaks of rabies occur in the dry season which coincides with the breeding season of dogs in most parts of Nigeria. Presence of these outbreaks might stimulate dog owners to vaccinate their dogs against rabies during this period.
The presence of antigen to rabies virus (7.98%) in brain tissues of dogs slaughtered for human consumption is a clear indication of the presence of rabies virus and plays a significant role in the epidemiology of the disease in the area. Factors such as lack of awareness on the availability of human anti-rabies vaccines, low vaccination coverage in dogs, non-wearing of protective clothing by dog meat processors, dog bites and exposure of cuts or wounds to saliva and brain tissue during dog meat processing all put dog meat processors and dog owners at high risk of being exposed to rabies virus.
Acknowledgements
Our appreciation goes to the staff of the State Veterinary Hospital Wukari, Taraba State Nigeria, especially Drs. Udi Nifyi and Geoffery Jatau for making hospital case files and vaccination records available for this study.
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