While it is still unclear to local authorities how the babies contracted the virus, the incident is being investigated to determine if it could have been passed through the mother’s placenta.
Of the triplets, a boy and a girl are stable and under observation at an isolation ward in a hospital in San Luis Potosí state, while the third child is being treated for respiratory problems.
“It would be impossible for them to have been infected at the moment of birth,” Mónica Liliana Rangel Martínez, state health secretary, said. Samples have also been taken from the parents to determine their COVID-19 status.
Although there have been records of infections involving babies contracting the virus after birth, researchers from the Yale School of Medicine, in a study published in May 2020, document the first case of COVID-19 infection in the placenta.
In another study published in June 2020, the conclusion held that “neonatal COVID-19 infection is uncommon, uncommonly symptomatic, and the rate of infection is no greater when the baby is born vaginally, breastfed or allowed contact with the mother.”