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SARS is caused by a type of coronavirus, which usually produces colds in humans but severe conditions such as pneumonia and diarrhoea in animals. The SARS virus was thought to have mutated to allow it to jump the species barrier from animals to humans. Analysis of the virus genome suggests that it is a recombinant of a mouse hepatitis virus and a bird bronchitis virus. The incubation period of SARS varies but is on average between two and ten days. The risk of death increases with age and the mortality rate is as high as 50% in those over 60 years of age.
The black fimbriation (narrow border) expresses endurance. White stands for Guyana's rivers. Effective date: 26 May 1966.
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