False colour transmission electron micrograph of a single bacterium of the genus salmonella,showing numerous flagellae - the bacterium's propulsion unit. All members of the salmonella genus are intestinal parasites including S. typhi & S. paratyphi,responsible for typhoid and paratyphoid fevers in humans. Other species and serotypes are responsible for gastro-enteritis or food poisoning. Different types are classified according to their antigenic nature; some 1800 serotypes have been distinguished. S. typhi (the typhoid bacillus) is wholly parasitic,with man its only natural host. Epidemics spread via water/food supplies from a human source | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / CDC |
Taille de l’image : | 4646 px × 3119 px |
Model Release : | Non requis |
Property Release : | Non requis |
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