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1b.3 How do seasonal variations influence disease outbreaks? (Winter…
1b.3
How do seasonal variations influence disease outbreaks?
Physical factors affect disease
Vector-borne diseases
account for more than
17%
of all infectious diseases, causing more than
1 million deaths
annually
Summer diseases
Lyme Disease
: when people are exposed to ticks in gardens and woods.
Asthma and hay fever
: more air pollution, higher pollen.
Sunstroke
Winter diseases
Cold
Flu
Strep throat
Pneumonia
Heart attacks
Monsoons
Malaria
- more stagnant water for breeding
Typhoid
- contaminated food and water - flooding and crosscontamination
Diarrhea
Viral infections
Droughts
Hygiene drops so more likely to spread more diseases
Viruses/bacteria can pollute ground and surface water when rainfall decreases
E.coli and salmonella - not washing food
Dust form dry weather causes fungal diseases
El Nino
While
El Nino
brings wetter and warmer weather to
East Africa
, rainfall is not the only variable that appears to impact cholera rates.
Cholera is linked to vulnerable water systems. In some areas, massive rainfall can overrun sewer and contaminate drinking water, In other locations, however, dry conditions can mean that clean water sources aren't available and people must consume water from sources known to be contaminated.