A set of premature triplets born in Mexico on Monday tested positive for Covid-19, although both parents do not have the disease, the health secretary of the Mexican state of Potosí said in a Facebook post.
Health authorities say the case is "unheard of" and "a very relevant scientific feat." They are investigating several potential sources of contagion such as the mother's breast milk.
"Now that we have the negative result of the PCR tests done on both parents, the case it's even more relevant, not only for the investigation our doctors in the state are doing but for the worldwide research on the behavior of the virus itself," said Potosí's Health Secretary Monica Liliana Rangel Martinez.
The premature triplets were born in the Ignacio Morones Prieto Central Hospital and are in a stable condition. Authorities say one of the babies has developed a respiratory infection but "is responding well to antibiotics." The mother is also recovering in hospital.