1b.3 How do seasonal variations influence disease outbreaks? (Winter…
How do seasonal variations influence disease outbreaks?
Physical factors affect disease
account for more than
of all infectious diseases, causing more than
1 million deaths
: when people are exposed to ticks in gardens and woods.
Asthma and hay fever
: more air pollution, higher pollen.
- more stagnant water for breeding
- contaminated food and water - flooding and crosscontamination
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
brings wetter and warmer weather to
, 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.