Table 1. CT Prevalence Studies in India.

Area	Year	Age group	Study population	N	Sample	Test	Prevalence	Ref
Vellore, India	1993	Not available	Pregnant women	273	Endocervical swab	Chlamydiazyme kit (Abbott, USA)	3.3% (95% CI: 1.2%–5.4%)	5
New Delhi, India	1995	Mean Age: 34.9 yrs	Generally healthy women, Gynecological clinic(outpatient department)	257	Endocervical swab	Chlamydiazyme kit (Abbott, USA)	23.3%	14
Mumbai, Inner City	1998	≤35 yrs	Suspected PID, Infertility	446	Endocervical swab	ELISA	0.5%	7
Mumbai	2001	18–42 yrs	Gynecological clinic, complications associatedwith reproductive health	123	Endocervical swab	Chlamydiazyme kit (Abbott, USA)	1.7 to 20% among different risk categories	11
New Delhi	2003	18–40 yrs	Symptomatic women Gynecological clinic	280	Endocervical swab	NAAT	28% (18–25 yrs)	13
New Delhi	2003	19–36 yrs	Pregnant women	350	Endocervical swab	DFA & PCR	18.8% (95% CI 14.76–22.96%)	12
Tamil Nadu, South India	2004	15–45 yrs	Healthy adult population, clinic	1066 (serum)841 (urine)Female samples	Serum, urine	IgM-ELISA,urine NAAT	3.3% ELISA, 1.1% PCR (95% CI: 0.4–1.8%)	8
Chennai	2005	N/A	STI clinic(high risk)	143 men & women	Serum, genital swab endocervical/urethral	Culture/nested PCR (MOMP): CT Serum: IgG	30.8% by nested PCR(MOMP)	9
Aligarh, North India	2009	18–40 yrs	Obstetric clinic, secondary infertility, pregnant women (control subjects)	70	Endocervical swab	Cell culture, ELISA	55%–2°infertility; 5.5% pregnant women	10
Karnataka State,South India	2010	Mean age: 30.7 yrs	Symptomatic women Gynecological clinic	412	Endocervical swab	NAAT	2.6%, vaginal discharge; 2.7% vaginal discharge with clinical cervicitis	6

This table shows a review on Indian data which show a wide variation in CT prevalence and methods of laboratory confirmation.