UK health chiefs have identified four deadly viruses currently circulating in the UK that could trigger the next pandemic, including a measles-like virus that could be more dangerous than Covid. The government has launched a new reference document to keep scientists and researchers updated on the latest threats. The viruses of concern include those from the Picornaviridae and Paramyxoviridae families, which can cause polio-like diseases and respiratory tract infections, as well as the Nipah virus, which can cause brain swelling and death. Other viruses on watch include coronaviruses, bird flu, and antibiotic-resistant bacteria.