Diseases, Conditions, Syndromes

What parents need to know about measles

Measles is a highly contagious disease caused by the measles virus. The infection can lead to serious and sometimes fatal complications. Fortunately, measles is a vaccine-preventable illness.

Diseases, Conditions, Syndromes

Q&A: How worried should we be about US measles outbreaks?

It's one of the most contagious viral diseases in the world—and outbreaks are popping up across the United States. More than 60 measles cases have been reported so far this year in 17 states, from Washington to Florida; ...

Diseases, Conditions, Syndromes

Understanding measles and the current outbreak

Measles used to be a common childhood illness years ago. At the beginning of this century, measles had been declared eliminated from the country. But now, measles, one of the most contagious diseases to spread, is returning ...

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Measles, also known as rubeola or morbilli, is an infection of the respiratory system caused by a virus, specifically a paramyxovirus of the genus Morbillivirus. Morbilliviruses, like other paramyxoviruses, are enveloped, single-stranded, negative-sense RNA viruses. Symptoms include fever, cough, runny nose, red eyes and a generalized, maculopapular, erythematous rash.

Measles (also sometimes known as English Measles) is spread through respiration (contact with fluids from an infected person's nose and mouth, either directly or through aerosol transmission), and is highly contagious—90% of people without immunity sharing living space with an infected person will catch it. An asymptomatic incubation period occurs nine to twelve days from initial exposure and infectivity lasts from two to four days prior, until two to five days following the onset of the rash (i.e. four to nine days infectivity in total).

An alternative name for measles in English-speaking countries is rubeola, which is sometimes confused with rubella (German measles); the diseases are unrelated.

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