[Table/Fig-6]:

Salient features of reviewed literature [1–6,8,9,13–25]

Sl. No.	Author	Year	Sample size	Study period	Periodicity of follow-up	Attack rate	Age group
1	NK Mitra [1]	1997	63	6 m	2 wk interval	Incidence density rate: 19.57(15.6-24.57)/ 100 person months. i.e. 1.17 episodes/child/ 6 months	Under 5 y
2	MP Singh [2]	1990	384	1 y	1 month interval	3.67 episodes/child/yr	Under 5 y
3	VP Reddaiah [3]	1986	5,078	1 y	1 month interval	3.67 episodes /child/yr	Under 5 y
4	Acharya D [4]	1996	91	1 y	2 wk interval	6.42 episodes/child/yr	Under 3 y
5	MR Savitha [5]	2005	104	6 m		Case-Control risk factor study	Under 5 y
6	VP Reddaiah [6]	1987	5,335	1 y	1 month interval	0.29 episodes/child/yr	Under 5 y
7	SK Kapoor [8]	1990	106			3.67 attacks/child/year KAP study
8	Gupta KB [9]	1990	120	1 y	1 wk interval	2.5 episodes/child/year	Under 5 y
9	Murali madhav S [13]	1989	985		2 wk interval	33 episodes/ 100 under fives	Under 5 y
10	Chhabra P [14]	1990	366	6	2 wk interval	2.5 episodes/child/year	Under 5 y
11	K Zaman [15]	1997	696	1 y	4 day interval	5.5 episodes/child year	Under 5 y
12	A Biswas [16]	1999	112	1 y	2 wk interval	5.7±1.7 episodes/child/yr	Under 5 y
13	Arnold Monto S [17]	1974		6 y		5.5 episodes/child/year	Under 4 y
14	Rohit Banerjee [18]	2003	220	2 y	1 month interval	6.4 episodes/child/yr	Under 1 y
15	Pandey A [19]	1991	200	1 y	2 wk interval	5.9 episodes/child/year	Under 5 y
16	Thelma Tupasi E [20]	1988	~650	2 y	2 wk interval	3-4 episodes/child/ year	Under 5 y
17	BNS Walia [21]	1982	227	2 y	2 wk interval	1.3 episodes/child/year	Under 5 y
18	HN Bashour [22]	1989	1030	6 m	Every week	3.4 episodes/100 child days (~ >10epi / yr)	Under 5 y
19	WHO memo [23]					70-100 episodes/1,000 children	Under 5 y
20	E Fagbule [24]	1994	481	1 y	Once in 2 days	3 episodes/child/ year	2 - 60 m
21	AK Sharma [25]	1999	150	1 y	1 wk interval	6.11 episodes/child/ year	Under 5 y
22	Ramani VK (present study)	2006	400	1 y	Every month	Incidence rate: 27.25%, Attack rate: 3.27 episodes/child/yr	Under 5 y