The Centers for Disease Control and Prevention (CDC) is a national public health agency in the United States.

Epidemiology is the study of how diseases spread and impact populations.

Google Scholar is a freely accessible web search engine that indexes scholarly literature across many disciplines and sources.

The Johns Hopkins Bloomberg School of Public Health is the public health graduate school of Johns Hopkins University, a private research university in Baltimore, Maryland.

Oxford University Press (OUP) is the largest university press in the world, and a department of the University of Oxford.

Public health refers to the science and art of preventing disease, prolonging life, and promoting health through organized efforts and informed choices of society, organizations, public and private communities, and individuals.

PubMed is a free search engine for accessing a vast collection of biomedical literature, including scientific journals, clinical research papers, and articles on health-related subjects.