The World Health Organization (WHO) reports that about 216 million people became seriously ill from
malaria in 2010 and about 655,000 people died.1
Most cases of malaria and most of the deaths
caused by malaria occur in Africa.1
Although most cases of malaria are caused by Plasmodium falciparum or P. vivax,
P. falciparum accounts for almost all of the deaths
caused by malaria.1
People traveling to Africa may have a higher risk of
infection, because they frequently stay outdoors and often camp in rural areas
where mosquitoes are common. There may be no risk of malaria (even in
malaria-infested areas such as Southeast Asia and South America) if travelers
stay in urban or resort areas where there are fewer mosquitoes.
Frostbite refers to the freezing of body tissue (usually skin) that results when the blood vessels contract, reducing blood flow and oxygen to the affected body parts.
Normal sensation is lost, and color changes also occur in these tissues.
Frostbite is most likely to affect body parts that are farther away from the body core and, therefore, have less blood flow. These include your feet, toes, hands, fingers, nose, and ears.
There are three degrees of cold injury: frostnip, superficial frostbite,...
In the United
States 1,691 people developed malaria in 2010 (the most recent year for which
statistics are available). Most of the people were infected with
P. falciparum malaria. Several of the people were infected with more than one type of malaria. Nine of the people died.2 Cases of malaria in the U.S. occur primarily in
international travelers, military personnel, and immigrants from countries
where malaria is present.
World Health Organization (2012). World Malaria Report 2012. Available online: http://www.who.int/malaria/publications/world_malaria_report_2012/en/index.html.
Centers for Disease Control and Prevention (2012). Malaria surveillance—United States, 2010. MMWR, 61(SS02): 1–17. Available online: http://www.cdc.gov/mmwr/preview/mmwrhtml/ss6102a1.htm?s_cid=ss6102a1_w.
Primary Medical Reviewer
E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer
W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
April 11, 2013
WebMD Medical Reference from Healthwise
April 11, 2013
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