Infection. 2006 Dr. Nasser Rizk. Infection. Invasion and multiplication of microorganisms inside body producing S&S and immune response. Severity of infection depends on : 1- Pathogenicity 2- number 3- host defenses Transmission of infection needs:
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Dr. Nasser Rizk
1- Pathogenicity 2- number 3- host defenses
1- Causative agent 2- reservoir 3-port of transmission 4-susceptible host
2 –Renal failure
3- Liver cirrhosis
5-Immunosuppresive drugs (transplantation)
Acquired immune suppression in:
stress malnutrition infections
1- Poor hygiene
3- Inadequate barriers
5- Chronic diseases
6- Inadequate treatment
Dust facilities transport of pathogens,
e.g., Aspergillus, (lung)
Mode of transmission
Means from portal of exit to host
4 modes: chart 3
Vector- born: flea, mosquito (tropical)
vague complaint, transmission.
microbes destroy host cells, affecting systems.
body defense take over the microbe, healing.
2- Muscle aches
Moe specific symptoms
1- tissue injury 2- infection 3- allergy
arterioles constrict then dilate--------edema
inflamm. Cells release histamine---edema
Which dilute microbes
Another picture of the same thing…
At a higher power!