Table 1.

Characteristics of HIV-1-infected infants (n=10)

Characteristic	Case
	1	2	3	4	5	6	7	8	9	10
Age at first positive HIV-1 diagnostic test, d	3	3	4	7	3	161	69	49	39	87
HIV-1 diagnostic test results a	3 (positive)	3 (3 760 000)	4 (760)	7 (1183)	3 (2922)	4 (<400)	4 (<400)	4 (<400)	39 (466 000)	87 (750 000)
	38 (positive)	52 (14 500)	60 (>750 00 0)	54 (650 998)	46 (382 916)	161 (314 760)	69 (602 555)	49 (580 000)	242 (720 000)	213 (395 712)
			79 (positive)	69 (597 242)	74 (1 571 690)	187 (710 104)	188 (123 694)	59 (123 089)	Not tested	Not tested
Estimated timing of MTCT of HIV-1	In utero	In utero	In utero	In utero	In utero	Intrapartum	Intrapartu m	Intrapartu m or postnatal	Unknown	Unknown
Birth weight, g	2600	2400	3100	2900	3000	2900	3500	3200	2900	3800
Pediatric estimate of gestational age at delivery, wk	36	38	39	39	41	38	38	38	38	40
Antiretroviral prophylaxis regimen	Zidovudin e	Zidovudi ne + lamivudin e + lopinavir/ ritonavir	Zidovudi ne	Zidovudin e	Zidovudi ne	Zidovudine	Zidovudin e	Zidovudin e	Zidovudi ne	Zidovudi ne
Exposure to breast milk	No	No	No	No	No	No	No	Yes b	No	No
Resistance testing:
Study visit	Enrollme nt	Data not available	6–12 wk	6–12 wk	6–12 wk	Data not available	6–12 wk	6–12 wk	6–12 wk	6 mo
HIV-1 subtype	B	---	B	F1	B	---	B	B	C	B
Drug resistance	None	---	None	None	None	---	None	None	None	Efavirenz ; nevirapin e

Abbreviation: MTCT, mother-to-child transmission.

^aValues are given as age in days at HIV-1 testing (test result). HIV-1 diagnostic test results refer to DNA polymerase chain reaction assay (positive or negative) and viral load (copies/mL).

^bCase 8 was exposed to breast milk on 1 occasion at approximately 2 weeks of age.