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Legionella - pathogenic Gram negative bacterium. Acquired its name after a July, 1976 outbreak of a then-unknown "mystery disease" sickened 221 persons, causing 34 deaths. The outbreak was first noticed among people attending a convention of the American Legion - an association of U.S. military veterans

Legionella is a pathogenic Gram negative bacterium, including species that cause legionellosis, most notably L. pneumophila. It may be readily visualized with a silver stain.

H3N2 | scamazine This negatively-stained transmission electron micrograph (TEM) revealed the presence of a number of Hong Kong flu virus virions, the H3N2 subtype of the influenza A virus. This virus is a Orthomyxoviridae virus family member, and was responsible for the flu pandemic of 1968-1969, which infected an estimated 50,000,000 people in the United States, killing 33,000.

from National Geographic News

Best Science Pictures of 2011 Announced

Toxic Cucumber by Robert Rock Belliveau via nationalgeographic: The pointed trichomes are 40 times thinner than a sewing needle, can prick animals' mouths and contain cucurbiticin, a toxic bitter substance which repels or even kills invaders. Cucurbiticins are so bitter that people can taste their presence even when the substance is diluted to one part per billion. #Sea_Cucumber #Robert_Rock_Belliveau #nationalgeographic #Photography

from Live Science

Tiny & Nasty: Images of Things That Make Us Sick

An image from 2005 shows virus particles from the 1918 flu virus, which scientists sequenced and then recreated. These particles were collected from an infected cell culture made of dog's kidney cells. The Spanish flu of 1918 killed more than 500,000 people in the United States and up to 50 million worldwide, according to the U.S. Centers for Disease Control and Prevention.

Giardiasis is a diarrheal illness caused by the parasite Giardia intestinalis (also known as Giardia lamblia or Giardia duodenalis). A parasite is an organism that feeds off of another to survive. Giardiasis is a global disease. It infects nearly 2% of adults and 6% to 8% of children in developed countries worldwide. Nearly 33% of people in developing countries have had giardiasis. In the United States, Giardia infection is the most common intestinal parasitic disease affecting humans.