It has been known for a long time that polio vaccines contained a monkey virus called the coryza virus, which was later renamed respiratory syncytial virus (“RSV”).In humans, RSV causes mild, cold-like symptoms but may be severe in a small number of people, especially in infants and older adults.Since August last year, regulators in Western countries have approved Pfizer’s RSV vaccine for use in pregnant mothers that increases the risk of pre-term birth, which carries risks of short and long-term health complications for the baby.On 21 August 2023, the US Food and Drug Administration (“FDA”) approved Pfizer’s Abrysvo vaccine. It...