Overview Enveloped viruses usually acquire their envelope from the host cell's plasma membrane occurs during exit from cell except herpesviruses acquire envelope from host nuclear membrane enveloped viruses can be disrupted by organic solvents DNA enveloped viruses herpesviruses HBV smallpox virus DNA nucleocapsid viruses adenovirus papillomaviruses parvovirus RNA enveloped viruses influenza virus parainfluenza virus RSV measles virus mumps virus rubella virus rabies virus HTLV HIV (shown in illustration) RNA nucleocapsid viruses picornaviruses (enterovirus type) poliovirus coxsackievirus echovirus HAV rhinovirus reoviruses rotavirus calciviruses norwalk virus