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Human Disease and Their Control follow up questions 1a) When people refer to pathogens, they are talking about bacteria that cause disease. 1b)The toxins actually excreted by the pathogens are the main cause of diseases although thetoxins are only by-products of the pathogen's metabolism. 2a)In most cases, the toxins excreted by the pathogens find there way into the circulatory system. Thus, sometimes, the infection is caused somewhere else from where the toxins were …

…substance used for artificial passove immunity. 13a) Antibiotics are something produced by an organism to prevent or slow down the growth of pathogens. 13b) Some commonly used antibiotics would be penicillin, erythromycin, streptomycin, neomycin, and terra mycin. 13c) The problem with antibiotics is that too much or over dosage would kill even the bacteria in our stomach and sooner or later, the pathogens would develop a strain which would not be affected by this antibiotic.