Determine whether each scenario relates to the number of...

Determine whether each scenario relates to the number of bacteria or adherence to the host tissue: Enteropathogenic strains of *Escherichia coli* have fimbriae that bind to specific regions of the small intestine. For cutaneous anthrax, the infectious dose is 10 to 50 endospores, whereas for inhalation anthrax and gastrointestinal anthrax, the infectious doses are 10,000 to 20,000 and 250,000 to 1,000,000 endospores, respectively.

Transcript

00:01 Hello students, the question asked is we have to place the following footborne causative agents in order from least to most virulent according to their infectious dose which is denoted as id50.

00:30 So the footborne causative agents in order from least to most virulent are the least virulent among the given microbes on the basis of id50 is staphylococcus aureus whose id50 dose is 100 ,000 to 8 million id50 and then for the second number would be which is more virulent than the staphylococcus aureus is the listeria monocytogenes whose id50 is 1000 and on the third number will be hepatites a whose id50 is 10 to 100 and then the fourth one would be escherichia coli whose id50 is 10 and then fifth one will be norovirus whose id50 is 1 to 10 and the most virulent among them would be the giardia namlia whose id50 dose is because id50 means that amount of pathogen required to kill 50 percent of population or host so the id50 if it is less which means that less microbes are needed to kill the 50 percent of the host that means the microorganism is more virulent if id50 is more value that means the microbe is less virulent so if we are arranging the microbes from least to most virulent which means from higher id value to lower id value another question asked is provide four reasons why staphylococcus aureus which has id50 from 100 000 to 8 million has such a large range of id50.

04:21 The first reason is that staphylococcus aureus produces variety of virulence factors so s aureus is produced is known to produce a large range of toxins and enzymes that contribute to its pathogenicity and the production of these virulence factors can vary among different strains and leading to the differences in infectious doses.

05:12 Second one is the host immune response.

05:20 The host immune response plays a crucial role in determining the outcome of the infection...

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