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Advanced nitrox certification (Advanced nitrox diver) requires competence to carry two nitrox mixtures in separate scuba sets, and to use the richer mix for accelerated decompression at the end of the dive, switching gases underwater at the correct planned depth and selecting the new gas on the dive computer if one is carried. For the purposes ...
Also sometimes called the Norwalk virus or winter vomiting bug, norovirus is an extremely contagious virus. It is a common cause of illness outbreaks on cruise ships, where more than 90% of ...
Norovirus infections occur more commonly during winter months. [6] It often occurs in outbreaks, especially among those living in close quarters. [3] In the United States, it is the cause of about half of all foodborne disease outbreaks. [3] The virus is named after the city of Norwalk, Ohio, US, where an outbreak occurred in 1968. [10]
Sapovirus is a genetically diverse genus of single-stranded positive-sense RNA, non-enveloped viruses within the family Caliciviridae. [1] [2] Together with norovirus, sapoviruses are the most common cause of acute gastroenteritis (commonly called the "stomach flu" although it is not related to influenza) in humans and animals.
A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [ 1 ] Examples are the common cold , gastroenteritis , corona , flu , pneumonia .
Vaccination is a cheap and effective way of preventing infections by viruses. Vaccines were used to prevent viral infections long before the discovery of the actual viruses. Their use has resulted in a dramatic decline in morbidity (illness) and mortality (death) associated with viral infections such as polio, measles, mumps and rubella. [160]
Polyomaviridae is a family of viruses whose natural hosts are primarily mammals and birds. [1] [2] As of 2024, there are eight recognized genera. [3]Fourteen species are known to infect humans, while others, such as Simian Virus 40, have been identified in humans to a lesser extent.
A rare but deadly disease spread by mosquitoes has one town in Massachusetts closing its parks and fields each evening. State health officials announced last week a man in his 80s had caught the ...