Viral Haemorrhagic Fevers

Viruses

Structure

Steps to differentiate

1. DNA (or) RNA
2. +ve sense icosahedral (or) -ve sense helical
3. naked (or) enveloped

Non-enveloped RNA virus

• Calcivirus
• Picornavirus
• Reovirus
• Herpevirus

Non-enveloped DNA virus

• Parvovirus
• Adenovirus
• Papillomavirus
• Polyomavirus

Ether and other organic solvents dissolve the lipid  bilayer that makes up the outer viral envelope.

Loss of infectivity after ether exposure is a characteristic  feature of enveloped viruses.