Virus and bacteria in influenza.
D006192:Haemophilus Infections / Q000150:complications; D006801:Humans; D007251:Influenza, Human / Q000150:complications* / Q000382:microbiology; D008589:Meningococcal Infections / Q000150:complications; D011023:Pneumonia, Staphylococcal / Q000150:complications; D011024:Pneumonia, Viral / Q000150:complications