Biohazards Bacteria and Viruses

Structure of a Bacterium

Set 20—No. 2: Typhoid Bacteria—2000 X

Set 20—No. 2: Typhoid Bacteria More info: The long “threads” are flagella. Water and food contaminated by infected material may contain the bacteria.

Set 20—No. 3: Pneumonia Bacteria—2000 X

Set 20—No. 3: Pneumonia Bacteria More info: White blood cells usually kill them as fast as they grow, preventing us from getting sick.

Set 20—No. 6: Botulism Bacteria—2000 X

Set 20—No. 6: Botulism Bacteria More info: This bacterium causes “food poisoning”. Killing the bacteria will not destroy the toxin it produces.

Structure of Viruses

Set 97—No. 1: Bacteriophage Virus—45,000 X Close up of virus

Set 97—No. 1: Bacteriophage Virus More info: The V and the arrows show the viruses. The line at the top left = 1 micrometer or 1 x 10-6 m. E = E. coli bacterium

Set 97—No. 6: Viruses Breaking out of a Cell—90,000 X

Set 97—No. 6: Viruses Breaking out of a Cell More info: Three viruses can be seen here. A cell membrane (M) is a wall surrounding a cell that protects the cell.

Set 97—No. 4: Measles Virus Damage—400 X

Set 97—No. 4: Measles Virus Damage More info: Normal cells are separated from each other and have rounded nuclei. Infected cells have no cell membrane and clump together. The virus are too small to be seen here.