Influenza--United States.  [electronic resource] 

 -  MMWR. Morbidity and mortality weekly report  Jan 1981 
 - 615-6 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0149-2195 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humans<br/>Influenza, Human--epidemiology<br/>United States