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A switch from glutamine to leucinein resulting from just one mutation could switch the virus from being able to easily bind to avian, or bird, receptors to favouring human receptors in the respiratory tract.

Pope Francis died Monday in Rome at the age of 88, just weeks after he was released from hospital following a respiratory tract infection that developed into pneumonia.

His health again began to deteriorate Feb. 14, when he was admitted to Gemelli hospital for what was described as a respiratory infection.

Mrs Lakin's cause of death was recorded as "respiratory compromise by support belt" and "postural impairment" along with her Parkinson's disease and a rare neurological condition called corticobasal syndrome.

Arakawa died around Feb. 11 of hantavirus pulmonary syndrome, a rare and often fatal respiratory illness spread by rodents, according to the New Mexico medical investigator’s office.