Diseases, Conditions, Syndromes

Infectious diseases A to Z: the common cold versus the flu

Influenza and the common cold are respiratory illnesses caused by viruses. The more intense flu symptoms tend to come on more abruptly than the gradual, more mild symptoms of a cold. Dr. Nipunie Rajapakse, a pediatric infectious ...

Diseases, Conditions, Syndromes

Virus renews safety concerns about slaughtering wild animals

China cracked down on the sale of exotic species after an outbreak of a new virus in 2002 was linked to markets selling live animals. The germ turned out to be a coronavirus that caused SARS.

Cardiology

Caring for your heart is critical during the winter months

We may be starting the new year with mild temperatures, but we still have a long stretch of winter months ahead. As the temperatures inevitably turn more seasonable, it's important to keep up with your health, especially ...

Diseases, Conditions, Syndromes

Questions complicate efforts to contain new virus from China

Reports one day suggest the respiratory outbreak in China might be slowing, the next brings word of thousands more cases. Even the experts have whiplash in trying to determine if the epidemic is getting worse, or if a backlog ...

Diseases, Conditions, Syndromes

Beijing orders returnees to quarantine as virus death toll hits 1,523

The death toll from China's new coronavirus epidemic jumped past 1,500 on Saturday as Beijing ordered people returning to the capital from holiday to self-quarantine for 14 days in another drastic effort to contain the outbreak.

Diseases, Conditions, Syndromes

US will test people with flu symptoms for novel coronavirus

The US will begin testing people identified by local health authorities as having flu-like symptoms for the novel coronavirus, a senior official said Friday, a significant expansion of the government's response to the epidemic.

Diseases, Conditions, Syndromes

No 'Plan B' for Olympics; questions over Chinese presence

Tokyo Olympic organizers and the International Olympic Committee said Friday there is no "Plan B" for the 2020 Games, which open in just over five months and have been jolted by the outbreak of a virus in neighboring China.

Vaccination

Influenza vaccination of children cuts hospitalization in half

Fully vaccinating children reduced the risk of hospitalization for complications associated with influenza by 54%, according to a new study by Ben-Gurion University of the Negev (BGU) and University of Michigan researchers.

page 1 from 23

Influenza, commonly referred to as the flu, is an infectious disease caused by RNA viruses of the family Orthomyxoviridae (the influenza viruses), that affects birds and mammals. The most common symptoms of the disease are chills, fever, sore throat, muscle pains, severe headache, coughing, weakness/fatigue and general discomfort. Although it is often confused with other influenza-like illnesses, especially the common cold, influenza is a more severe disease than the common cold and is caused by a different type of virus. Influenza may produce nausea and vomiting, particularly in children, but these symptoms are more common in the unrelated gastroenteritis, which is sometimes, inaccurately, referred to as "stomach flu." Flu can occasionally cause either direct viral pneumonia or secondary bacterial pneumonia.

Typically, influenza is transmitted through the air by coughs or sneezes, creating aerosols containing the virus. Influenza can also be transmitted by direct contact with bird droppings or nasal secretions, or through contact with contaminated surfaces. Airborne aerosols have been thought to cause most infections, although which means of transmission is most important is not absolutely clear. Influenza viruses can be inactivated by sunlight, disinfectants and detergents. As the virus can be inactivated by soap, frequent hand washing reduces the risk of infection.

Influenza spreads around the world in seasonal epidemics, resulting in the deaths of between &10000000000250000000000250,000 and &10000000000500000000000500,000 people every year, up to millions in some pandemic years. On average 41,400 people died each year in the United States between 1979 and 2001 from influenza. In 2010 the Centers for Disease Control and Prevention (CDC) in the United States changed the way it reports the 30 year estimates for deaths. Now they are reported as a range from a low of about 3,300 deaths to a high of 49,000 per year.

Three influenza pandemics occurred in the 20th century and killed tens of millions of people, with each of these pandemics being caused by the appearance of a new strain of the virus in humans. Often, these new strains appear when an existing flu virus spreads to humans from other animal species, or when an existing human strain picks up new genes from a virus that usually infects birds or pigs. An avian strain named H5N1 raised the concern of a new influenza pandemic, after it emerged in Asia in the 1990s, but it has not evolved to a form that spreads easily between people. In April 2009 a novel flu strain evolved that combined genes from human, pig, and bird flu, initially dubbed "swine flu" and also known as influenza A/H1N1, emerged in Mexico, the United States, and several other nations. The World Health Organization officially declared the outbreak to be a pandemic on June 11, 2009 (see 2009 flu pandemic). The WHO's declaration of a pandemic level 6 was an indication of spread, not severity, the strain actually having a lower mortality rate than common flu outbreaks.

Vaccinations against influenza are usually made available to people in developed countries. Farmed poultry is often vaccinated to avoid decimation of the flocks. The most common human vaccine is the trivalent influenza vaccine (TIV) that contains purified and inactivated antigens against three viral strains. Typically, this vaccine includes material from two influenza A virus subtypes and one influenza B virus strain. The TIV carries no risk of transmitting the disease, and it has very low reactivity. A vaccine formulated for one year may be ineffective in the following year, since the influenza virus evolves rapidly, and new strains quickly replace the older ones. Antiviral drugs such as the neuraminidase inhibitor oseltamivir can be used to treat influenza, however the effectiveness is difficult to determine due to much of the data remaining unpublished.

This text uses material from Wikipedia licensed under CC BY-SA