Infection wave due to new norovirus variant



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New variants of the diarrhea causing vomiting cause an increase in norovirus infections

The surveillance systems worldwide showed an increase in norovirus activity at the end of 2012, according to the latest announcement in the EU science magazine "Eurosurveillance" with reference to the data of the "NoroNet" network. The increase in norovirus infections is essentially due to "the emergence of a new norovirus genotype II.4", which is referred to as "Sydney 2012". The national health authorities are asked to prepare for a particularly difficult norovirus season.

In Great Britain, the Netherlands and Japan, "epidemiological and laboratory surveillance systems showed increased norovirus activity in late 2012 compared to previous years," reports the science magazine. Increases in norovirus infections were also observed in Australia, France and New Zealand. The experts explain that a new form of vomiting diarrhea called “Sydney 2012” is significantly involved in the rise in norovirus infections. The mutated noroviruses are even more aggressive than the previous variants and could cause a particularly difficult norovirus season. Due to the changed properties of the pathogen, the experts assume that fewer people are immune to the "Sydney 2012" noroviruses than to previous norovirus variants.

Particularly difficult norovirus season expected "The first molecular data from the international molecular surveillance database NoroNet from Australia, France, New Zealand and Japan show that the increase in norovirus infections" with the appearance of a new variant of genotype II.4 (GII.4) is connected, ”reports“ Eurosurveillance ”. As an informal network of scientists from the national health authorities and universities, "NoroNet" collects and disseminates all virological, epidemiological and molecular biological data on the norovirus. According to the experts, a particularly severe wave of infection is expected in winter 2012/2013. The number of diseases reported by the Robert Koch Institute (RKI) for 2012 of around 100,000 norovirus infections could be significantly exceeded this year. In any case, according to the RKI, norovirus infections have “been confirmed as the most common cause of epidemic gastroenteritis outbreaks in recent years.” Norovirus infections affect all age groups and are often the cause of group diseases with numerous victims in community facilities, such as kindergartens, especially in the winter months , Schools, nursing homes and hospitals, according to the RKI.

Norovirus infection Cause of vomiting diarrhea Typical symptoms of a norovirus infection are sudden onset diarrhea, abdominal pain, nausea and vomiting. Headaches, muscle and body aches are also often an expression of the norovirus infection. Due to the massive loss of fluid associated with the disease, the patient is at risk of dehydration (lack of fluid), which in the worst case can be life-threatening. (fp)

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Noro virus on the rise?

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