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Epidemic conjunctivitis: discovery of a new aetiologic agent.

Hitherto unknown picomaviruses recovered from patients during outbreaks of epidemic conjunctivitis in Singapore in 1970 and 1971 have been shown to be the cause of the infection. From September to December, 1970 a sudden outbreak of acute conjunctivitis of rapid onset assumed epidemic proportions never encountered in the country previously. The eye disease was characterized by mild to severe conjunctivitis, lid swelling, subconjunctival haemorrhage and Fe -auricular gland adenitis. Haemorrhagic features and absence of kerafitis clinically distinguished the disease from epidemic keratoconjunctivitis. A clinically similar epidemic occurred during June to December, 1971. Compared with reports from elsewhere, haemorrhagic features were not a constant characteristic of the infection in Singapore. Laboratory investigation demonstrated that different antigenic types of picornaviruses were responsible for the 1970 and 1971 outbreaks and that the 1971 outbreak was caused by a virus similar to the acute haemorrhagic conjunctivitis virus isolated in Japan in 1971. Serological findings confirmed the aetiologic significance of the isolates.