infants

But in infants and seniors, these viruses can cause severe pneumonia and even death.

The disease affects roughly 24 million people a year worldwide and primarily impacts infants and those with weakened immune systems.

Letby, 34, from Hereford, is serving 15 whole-life orders after she was convicted at Manchester Crown Court of murdering seven infants and attempting to murder seven others, with two attempts on one of her victims.

A senior coroner has warned that more babies could die unless "action is taken", following the deaths of three infants who had received contaminated feed while being cared for in hospital.

The World Health Organization recommends exclusively breastfeeding infants up to six months of age; however, in the U.S., only 26% of infants met this recommendation in 2020.