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kiaraj3 kiaraj3
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6 years ago
The majority of decline in whooping cough mortality in the United States after 1900 was due to the development of an effective vaccine.
 
  Indicate whether this statement is true or false.
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PaulinaPaulina
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6 years ago
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kiaraj3 Author
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6 years ago
Good timing, thanks!
megan.xo
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Yesterday
This site is awesome
homework1
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2 hours ago
Thanks
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