Which of the following is NOT true about influenza? None of the other four answers (All are true about influenza) Influenza viruses infect only humans Immunization against one subtype of influenza virus fails to protect against all subtypes Some cases result in lower respiratory tract infections, including pneumonia Influenza viruses are highly genetically variable and undergo antigenic drifts and shifts

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Viral Infections

Viruses are abundantly found, minute entities that have genetic material enclosed within a protein coat. The proteinaceous material enclosing the genetic material of the virus is called a capsid. The genetic material could be either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). A virus is too minute to be looked at with naked eyes and therefore visualized with the help of a microscope. They are acellular entities that require a host for processes, such as replication, transcription, translation and multiplication. Plants, animals, and bacteria act as host wherein the virus reproduce. Viruses cannot multiply outside the host's body and thus are considered nonliving outside the host body.