which virus causes smallpox ?
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https://www.mayoclinic.org › diseases-conditions › smallpox › symptoms-causes › syc-20353027https://www.mayoclinic.org › diseases-conditions › smallpox › symptoms-causes › syc-20353027 Smallpox – Symptoms and causes – Mayo Clinic […]
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when did they stop vaccinating for smallpox in canada ?
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https://www.thecanadianencyclopedia.ca › en › article › smallpoxhttps://www.thecanadianencyclopedia.ca › en › article › smallpox Smallpox in Canada | The Canadian Encyclopedia Modern smallpox vaccine production began […]
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