Area	No. tested sample	(+)^*	(%)	Degree of positivity (%)
Area	No. tested sample	(+)^*	(%)	1	2	3	4	5
District 9	20	15	75.0	40	40	13.3	6.7	0
District 12	101	80	79.2	67.5	27.5	5	0	0
Thu Duc	20	16	80.0	43.8	31.3	18.8	6.3	0
Binh Chanh	45	40	88.9	77.5	20	2.5	0	0
Binh Tan	25	20	80.0	70	20	10	0	0
Tan Phu	15	13	86.7	76.9	15.4	7.7	0	0
Tan Binh	20	20	100.0	30	50	20	0	0
Cu Chi	170	141	82.9	70.9	22.0	7.1	0	0
Hoc Mon	170	124	72.9	74.2	20.2	4.0	1.6	0
Go Vap	20	17	85.0	76.5	23.5	0	0	0
Total	606	486	80.2	68.5	24.1	6.6	0.8	0