World Health Organization:

• 'Regional Office for the Americas' website.

• 'Coronavirus disease 2019' website.

• 'Advice for public' information.

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Centers for Disease Control and Prevention:

• 'Coronavirus (COVID-19)' What You Need to Know.

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• 'The President's Coronavirus Guidelines for America' article.

• City of Boston's official government website for COVID-19 updates.