Table 2.

 Number of positive specimens in different age groups

	Age, months
	0–1	−6	−12	−36	−60	>60
Specimens tested	112	192	138	201	103	67
No. of positive specimens	68	148	111	154	79	41
% positive	60.71	77.08	80.43	76.6 2	76.70	61.94