Diseases, Conditions, Syndromes

Covid-19 reinfection casts doubt on virus immunity: study

COVID-19 patients may experience more severe symptoms the second time they are infected, according to research released Tuesday confirming it is possible to catch the potentially deadly disease more than once.

Diseases, Conditions, Syndromes

Where in the world will the next epidemic start?

Viruses jumping from animals to humans have been the starting point of numerous outbreaks, from Ebola to Zika. Given the similarity of SARS-CoV-2 to coronaviruses found in bats, this probably marked the beginning of COVID-19 ...

Diseases, Conditions, Syndromes

Sterilised insects could help control mosquito-borne diseases

Aggressive tiger mosquitoes capable of spreading debilitating tropical diseases such as dengue and Zika are spreading through Europe, but scientists hope it may be possible to control these biting pests with a form of insect ...

Diseases, Conditions, Syndromes

Researchers anticipate rise of some mosquito-borne diseases

All mosquitoes are not created equal. Different species of the flying pest thrive at various temperature ranges and transmit different diseases. From this starting point, a Stanford-led paper for the first time predicts how, ...

Diseases, Conditions, Syndromes

COVID-19 cases, deaths may follow weekly pattern

MIT, Boston University, and Harvard Medical School researchers have identified weekly oscillations in the numbers of new daily COVID-19 cases and deaths in several countries that are more pronounced than fluctuations seen ...

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Dengue fever

Dengue fever (pronounced UK: /ˈdɛŋɡeɪ/, US: /ˈdɛŋɡiː/) and dengue hemorrhagic fever (DHF) are acute febrile diseases, found in the tropics, and caused by four closely related virus serotypes of the genus Flavivirus, family Flaviviridae. It is also known as breakbone fever. The geographical spread includes northern Australia, northern Argentina, and the entire Singapore, Malaysia, Taiwan, Thailand, Vietnam, Indonesia, Honduras, Costa Rica, Philippines, Pakistan, India, Sri Lanka, Bangladesh, Mexico, Suriname, Dominican Republic, Puerto Rico, Jamaica, Bolivia, Brazil, Guyana, Venezuela, Barbados, Trinidad and Samoa. Unlike malaria, dengue is just as prevalent in the urban districts of its range as in rural areas. Each serotype is sufficiently different that there is no cross-protection and epidemics caused by multiple serotypes (hyperendemicity) can occur. Dengue is transmitted to humans by the Aedes aegypti or more rarely the Aedes albopictus mosquito, which feed during the day.

The WHO says some 2.5 billion people, two fifths of the world's population, are now at risk from dengue and estimates that there may be 50 million cases of dengue infection worldwide every year. The disease is now epidemic in more than 100 countries.

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