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EPIDEMICS' TIMING DETERMINED BY LATITUDEGoing back to 1945, Hope-Simpson discovered that influenza epidemics above 30 degrees latitude in both hemispheres occurred during the six months of least solar radiation and that outbreaks in the tropics almost always occured during the rainy season. He thus concluded, "Latitude alone broadly determines the timing of the epidemics in the annual cycle, a relationship that suggests a rather direct effect of some component of solar radiation acting positively or negatively upon the virus, the human host, or their interaction." That is, something may be regularly reducing our immunity every fall and winter. In 2003 researchers confirmed that influenza epidemics in the tropics occur, with few exceptions, during the rainy season, when vitamin D levels should be falling

The flu is a disease, accompanied mankind for centuries, but it remains a serious medical and social problem in our days. The flu can be manifested in the form of pandemics, epidemics, local outbreaks and isolated cases. Worst flu epidemics caused by type A influenza virus.The flu epidemics occur almost every year. The main factors that determine the risk of disease are: level then its predecessor specific immunity and age of infected them - the final ages are extremely susceptible to infection. Complications of influenza are mainly from the lungs, and less of the nervous system. They are more common in patients of advanced age.

Viral gastroenteritis, also known as stomach flu, is an inflammation of the mucous coating of the stomach and intestines caused by certain groups of viruses. They settled in the epithelial cells of the mucosa, where they multiply and cause damage to the normal structure and function. The stomach flu is a highly infectious and very common - every year there are tens of millions. Rotavirus. Rotaviruses are the leading cause of stomach flu in infants and young children. Incubation was continued for 1 to 3 days. Usually, the infection is accompanied by watery diarrhea, vomiting, fever and muscular pain for 3 to 7 days. Rotaviruses can infect and adults in contact with the ailing child. In adults, the stomach flu symptoms less severe. Calicivirus. Cause infections in people of all ages. Noroviruses are the most common calicivirus and the most common cause of stomach flu in adults. Often reaching epidemic. Usually epidemics broke out from October to April, but are possible at any time of year. Typical stomach flu symptoms include nausea, vomiting, abdominal pain, fatigue, headache and muscle aches. The symptoms started 1-2 days after contact with the virus and still 1 to 3 days. Adenoviruses. Mainly infects children under 2 years. There are 49 types of adenoviruses, one of which affects the gastrointestinal tract and causes nausea and diarrhea. The incubation period is 8-10 days and symptoms persist between one and two weeks. Adenoviral infections may occur at any time of year. Astroviruses. Infect mostly infants and children less adults. The symptoms are watery diarrhea and vomiting, continuing for up to one week, and appears after an incubation period of 3-4 days. Symptoms were less severe than Norovirus or rotavirus infections. Astroviruses stomach flu are most common during the winter months.

Flu symptoms in 2013 were widely well known, although a range of symptoms vary in number and intensity. Flu symptoms include fever, which rises quickly and sharply decreased after 3 to 5 days, pain in muscles and some joints, sore throat and irritating cough, runny and stuffy nose, headache. Heralds his heavy head, discomfort erythema eyes and sneezing. Fatigue and physical weakness are also typical of flu symptoms who stay up to two weeks after recovery.

In the preceding few days hundreds of people in Soho had died from the ravages of cholera, one of the most devastating and least understood diseases of the age. The yellow flags were a traditional plague warning, the lime chloride a desperate attempt at disinfection. Having made an effort to arrest the disease, most of Soho's terrified inhabitants had fled. Local hospitals were over flowing with the dying. At the height of the epidemic, 143 deaths were recorded in a single day. Corpses were so numerous; they were unceremoniously piled on carts and taken away for burial.

On the epidemiology of influenza. Cannell JJ, Zasloff M, Garland CF, Scragg R, Giovannucci E. Virol J. 2008 Feb 25;5:29. Review. PMID: 18298852 doi:10.1186/1743-422X-5-29

In adults stomach flu is caused most often by Norovirus, about 50% to 70% of cases. The new norovirus "Sydney 2012" is not associated with worse symptoms than other strains noroviruses. In the U.S., the Centre for Control and Prevention of Diseases show that Noroviruses cause 21 million illnesses annually. Of these, 70,000 cases require hospitalization and approximately 800 are fatal.