Table 1.

Studies examining the transmission of SARS-CoV-2 in breastmilk

Study	Number of positive mothers	Breastmilk samples tested with SARS-CoV-2-RT-PCR	Results of breastmilk samples
Liu et al. [6] (January 31 to February 29, 2020)	10 (laboratory confirmed positive) 9 (clinically diagnosed)	10	10 negative
Groß R et al. [7•]	2	Mother I—4 Mother II—7	Mother I—all negative Mother II—4 out of 7 positive (newborn unaffected)
Wu et al. [8] (January 31 to March 9, 2020)	5	3	1 positive (newborn positive but the mode of transmission unclear) 2 negative
Kirtsman et al. [9]	1	1	1 positive (newborn positive)
Chen et al. [10] (January 20 – January 31, 2020)	9	6	6 negative (newborns negative)
Zhu et al. [11] (January 20 – February 5, 2020)	9	9	9 negative (all tested 9 newborns negative)
Li et al. [12]	1	1	Negative (newborn was not tested)
Chambers et al. [13] (March 27 – May 6, 2020)	18	64	1 sample positive, but the virus was not replication-competent (the newborn related to the positive breast milk sample was not tested)
Tam et al. [14]	1	7	1st and 7th samples positive (10 days apart) The infant (8 months) was positive. The contamination of the sample was not ruled out.
Dong et al. [15]	1	1	Negative (day 6th after delivery) (newborn negative)
Marín Gabriel MÁ et al. [16]	7	7 (colostrum samples 1-h post-delivery)	All negative
Salvatori et al. [17]	2	2	Both negative (newborns were positive, but horizontal transmission was suspected)

RT-PCR, reverse transcription-polymerase chain reaction