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Today:%20Human%20Population

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Title: Today:%20Human%20Population


1
Today Human Population
Toxic Garbage Island movie W 4/21 at 5pm in JES
A121
2
What happens as populations approach their
carrying capacity?
3
36.4
9
2.3
UN Department of Economic and Social
Affairs Population Division (2004)
4
Fig 53.22
Human Population Growth
as of 4/15 at 1004pm6,815,080,019
5
Spanish flu of 1918-1919
6
Spanish flu of 1918-1919
  • Killed between 20-50 million people worldwide
    675,000 in the U.S.(2.5-5 of world population)
  • Infected 1/5 to 1/4 of world population
  • Was most lethal to people 20-40 years old

http//virus.stanford.edu/uda/
7
Spanish flu of 1918-1919
People on their way to work suddenly developing
the flu and dying within hours (Henig).One
physician writes that patients with seemingly
ordinary influenza would rapidly "develop the
most viscous type of pneumonia that has ever been
seen" and later when cyanosis appeared in the
patients, "it is simply a struggle for air until
they suffocate," (Grist, 1979).Another
physician recalls that the influenza patients
"died struggling to clear their airways of a
blood-tinged froth that sometimes gushed from
their nose and mouth," (Starr, 1976).
http//virus.stanford.edu/uda/
8
The high fatality rate from the Spanish flu was
probably due to an immune system over-reaction
9
Viruses
10
Viruses are very simple, and come in a variety of
shapes/compositions
Fig 19.3
11
Living organisms must fit all of the following
criteria (modified from Campbell Biology) 1.
They must have organization. 2. They must have
metabolism. 3. They must respond to the
environment. 4. They must be able to reproduce
themselves.
12
Viruses only harm cells by invading them and
using the cell to reproduce
13
Living organisms must fit all of the following
criteria (modified from Campbell Biology) 1.
They must have organization. 2. They must have
metabolism. 3. They must respond to the
environment. 4. They must be able to reproduce
themselves.
14
Fig 19.4
basic viral reproductive cycle
15
the relationship between viruses and disease
16
Virus 2
Virus 1
During co-infection viral genomes can be mixed
resulting in a new hybrid virus.
Virus 12
17
Spanish flu of 1918-1919
This influenza virus was similar to avian flu
18
Avian flu exists in two distinct forms High
pathogenicity AI virus that produce gt75
mortality (HPAI) Low pathogenicity is
everything else (LPAI)
Public Health Risk from Avian Influenza Viruses
by Perdue and Swayne in AVIAN DISEASES
49317327, 2005
19
Avian flu is maintained in wild birds as low
pathogenicity, and occasionally mutates to high
pathogenicity in domesticated birds. Approximatel
y 25 outbreaks since 1959 15 since 1990 and 6
since 2000
Public Health Risk from Avian Influenza Viruses
by Perdue and Swayne in AVIAN DISEASES
49317327, 2005
20
Viruses enter cells via membrane proteins.
virus
Membrane protein
cell
21
Viral genetic material can change allowing the
virus to infect different cells or organisms.
virus
Membrane protein
cell
22
Virus 2
Virus 1
During co-infection viral genomes can be mixed
resulting in a new hybrid virus.
Virus 12
23
Virus 2
Virus 1
One concern is a person who is infected with
human flu and high pathogenicity avian flu.
Virus 12
24
Public Health Risk from Avian Influenza Viruses
by Perdue and Swayne in AVIAN DISEASES
49317327, 2005
25
How is bird flu being spread? To lower the chance
of a pandemic, we need to understand the spread
of the disease.
Declan Butler NATURE Vol 439 pg 772 February 16,
2006
26
Bird Flu Spread
http//news.bbc.co.uk/1/shared/spl/hi/world/05/bir
d_flu_map/html/1.stm
27
Migratory wild birdsorPoultry trade (black
market) Prevention efforts will only be effective
if the source can be defined
28
If the flu is being spread by migratory birds,
why are some migratory routes free of flu?
Bird migration is mostly N? S
29
In 2004 an outbreak in Tibet was traced to
illegal poultry transport from China.
30
Even with todays vaccine technology and the
knowledge that vaccines will prevent severe
illness and death, only 300 million doses are
produced and used worldwide.More than 95 of the
worlds population remains at risk for
infection. Each year an estimated 250,000 to
500,000 people die worldwide as a result of
influenza virus infections.
Public Health Risk from Avian Influenza Viruses
by Perdue and Swayne in AVIAN DISEASES
49317327, 2005
31
It is estimated that in the United States, for
example, the yearly economic burden caused by
influenza deaths, infections, vaccinations, loss
of productivity, and attendant health care costs
is equal to 0.10.5 of the gross domestic
product.
Public Health Risk from Avian Influenza Viruses
by Perdue and Swayne in AVIAN DISEASES
49317327, 2005
32
Fig 52.17
36.4
9
2.3
UN Department of Economic and Social
Affairs Population Division (2004)
33
Toxic Garbage Island movie W 4/21 at 5pm in JES
A121
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