Table 1.

Demographic and clinical features of the 181 index cases and 452 household contacts.

Feature	Level	INDEX CASES (N = 181)	CONTACTS (N = 452)
Household size (total number of participating individuals)	2	43     (24%)	43     (10%)
	3	42     (23%)	84     (19%)
	4	65     (36%)	193   (43%)
	5	25     (14%)	99     (22%)
	6	4     (2%)	20     (4%)
	≥7	2     (1%)	13     (2%)
Gender	Female	103   (57%)	226   (50%)
	Male	78     (43%)	226   (50%)
Age group (years)	0 to 10	37     (20%)	93     (21%)
	11 to 18	55     (30%)	80     (18%)
	19 to 54	66     (37%)	233   (51%)
	>=55	23     (13%)	46     (10%)
Any Comorbidity	No	149   (82%)	380   (84%)
	Yes	32     (18%)	72     (16%)
Type of Comorbidity	Medicated asthma	17     (9%)	43     (10%)
(Subjects may have >1)	Diabetes	7     (4%)	11     (2%)
	Respiratory disease	1     (1%)	5       (1%)
	Neurological condition	5     (3%)	4       (1%)
	Heart disease	6     (3%)	6       (1%)
	Liver/kidney disease	2     (1%)	6       (1%)
	Immune compromised	3     (2%)	6         (1%)
	Malignancy	1     (<1%)	7         (2%)