Table I.

RT-PCR results in babies tested positive.

Study	No. of babies tested/total no. of babies in the study	1st RT-PCR	Time at which 1st RT-PCR done	2nd RT-PCR	Time at which 2nd RT-PCR done	3rd and subsequent RT-PCR	Time at which test done
Yu N et al	3/7	1 positive	36 hours	1 negative	within 2 weeks	1 negative	Within 2 weeks
Zeng L et al	33/33	3 positive	Day 2 & 4	3 negative	2 on Day 6 & 1 on day 7
Wang S et al	1/1	1 positive	36 hours	1 negative	Day 15
Ferrazzi E et al	42/42	2 positive 1 doubtful	Day 1	2 positive 1 positive	Day 3
Alzamora MC et al	1/1	1 positive	16 hrs	1 positive	48 hrs
Khan S et al	17/17	2 positive	24 hrs	Not tested
Nie R et al	26/28	1 positive	36 hrs	1 negative	Day 4	1 negative	Day 8 & 15
Carosso A et al	1/1	1 positive	0 hr	1 negative	37 hrs
Hu X et al	7/7	1 positive	36 hr	Not tested
Diaz SA et al	1/1	1 negative	Day 6	1 positive	Day 8	1 positive	Day 13
Zamaniyan M et al	1/1	1 negative	0 hr	1 positive	24 hrs	1 positive	1 week
Hantoushzadeh S et al	5/9	5 negative	Day 1	1 positive	Day 7
Kirtsman M et al	1/1	1 positive	At birth	1 positive	Day 2	1 positive	Day 3

This table includes all babies who were positive on RT-PCR at some point. Out of the 18 babies who were positive at some point, only 3 have positive result after 5 days of life. These 3 babies had initial negative result. All the rest had positive result within first 5 days and either became negative or were not tested further or continued to have positive result but these were within first 5 days.