Citing CDC
With Author names:
Cullen, K. A., Ambrose, B. K., Gentzke, A. S., Apelberg, B. J., Jamal, A., & King, B. A. (2018). Notes from the Field: Use of Electronic Cigarettes and Any Tobacco Product Among Middle and High School Students — United States, 2011–2018. MMWR. Morbidity and Mortality Weekly Report, 67(45), 1276–1277. https://doi.org/10.15585/mmwr.mm6745a5
No author names, organization instead:
Centers for Disease Control and Prevention. (1999). Control of infectious diseases. MMWR. Morbidity and Mortality Weekly Report, 48(29), 621–629. http://www.ncbi.nlm.nih.gov/pubmed/10458535
MMWR is a publication series, once published in print. Treat it like a journal with the author being the Centers for Disease Control and Prevention
https://www.cdc.gov/mmwr/about.html