e. Mode of Entry. The mode of entry refers to the method by which the
pathogens enter the person (host). For example, some pathogens are inhaled
(respiratory tract). Ways of controlling modes of entry are shown in figure 1-4.
MODES OF ENTRY
Wear a mask.
Respiratory Tract. Small residues (droplet nuclei)
respiratory tract of infected persons remain
suspended in the air of poorly ventilated spaces for
relatively long periods of time. The infectious
microorganisms can be inhaled by a well person
who may then become infected with the disease.
Dispose of body excretions
Gastrointestinal Tract. Pathogenic
microorganisms enter the body of new host when
food or water contaminated by feces is ingested.
Skin. Pathogenic microorganisms enter the body
when a person comes into contact with wound
Figure 1-4. Modes of entry and their control.
f. Susceptible Host. The host is the person who gets the disease. Once the
host has the disease, he becomes a reservoir for future transmission of the disease. A
listing of the most susceptible persons to disease and some control measures are
shown in figure 1-5.