@inbook{1196250264, author={Kenneth J. Ryan}, title={Poxvirus}, booktitle={Sherris & Ryan. MicrobiologĂ­a MĂ©dica, 8e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2022}, url={accessmedicina.mhmedical.com/content.aspx?aid=1196250264} }