<unk>  (also known as OpUSA,<unk>  California, or OpCal) is a non profit humanitarian organization supporting health, education and relief programs at home and abroad in order to help children and families recover and thrive in the wake of disasters. Working with grassroots community organizations, OpUSA strives to help the most overlooked and under-served communities. It is exclusively privately funded, receiving no assistance from the United States federal government. OPUSA had a revenue of over $2.6 million in fiscal year 2019, and since 1979 has delivered more than $400 million in aid to 100 countries.
Operation USA
Biological and Pharmaceutical Bulletin
BMC Medicine
Clinical associates
Fever hospital
Hospital corpsman
BioSentinel
OpenNotes