Photomicrograph of Treponema pallidum. This spirochaete bacterium is the agent of syphilis. 2007

Photomicrograph of Streptococcus pyogenes. S. pyogenes are gram-positive bacteria found in throat or nose of human beings. Howev 2007

Transmission Electron Micrograph (TEM) of Spanish flu virus. This Influenza virus type a, strain H1N1 is very close to the avian 2007

Photomicrograph shows stool exudates in a patient with shigellosis (also known as Shigella dysentery or Bacterial dysentery), ca 2007

Transmission Electron Micrograph (TEM) of poliovirus, an RNA enterovirus responsable for poliomyelitis. 2007

Photomicrograph of Haemophilus influenzae, a Gram-negative bacteria responsible for respiratory infections, otitis and meningiti 2007

Photograph of a body louse Pediculus humanus. 2007

Electron micrograph of parvovirus H-1 virions of the Parvoviridae family of DNA viruses. 2007

Photomicrograph of Neisseria subflava, a Gram-negative bacteria of the neisseriaceae family, counting 2 pathogenic species : Nei 2007

Electron micrograph of Neisseria gonorrhoeae, an aerobic Gram-negative bacterium responsible for the Sexually transmitted infect 2007

Electron micrograph of the La Crosse virus (LCV), a RNA Bunyaviridus responsible for La Crosse encephalitis. 2007

Electron micrograph of the Herpes simplex virus. 2007

Electron micrograph showing an amoeba Hartmannella vermiformis (orange) as it entraps a Legionella pneumophila bacterium (green) 2007

Photomicrograph of Hemophilus ducreyi, agent of the highly contagious sexually transmitted disease Chancroid or soft chancre. 2007

Photography of a flea. 2007

Micrograph of Dermatophilus congolensis, a gram-positive bacteria agent of dermatologic disease called dermatophilosis. 2007

Micrograph of Clostridium tetani, a Gram-positive bacteria responsible for causing tetanus. 2007

Photomicrograph of Clostridium botulinum (Bacillus botulinus). The bacterium Clostridium botulinum produces the nerve toxin whic 2007

Photograph of colonies of Citrobacter freundii cultured in Petri dish. This Gram-negative bacterium is naturally found in intest 2007

Photomicrograph of Borrelia burgdorferi, gram negative spirochete bacterium agent of the Lyme disease, passed on to human by the 2007