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<big><center>[[Infectious agents and parasites|'''BACK TO INFECTIOUS AGENTS AND PARASITES''']]</center></big>
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<big><center>[[Bacteria|'''BACK TO BACTERIA''']]</center></big>
 
[[Escherichia coli]]
 
[[Escherichia coli]]
    
[[Salmonella]]
 
[[Salmonella]]
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