**3.3 Based on their shape**

Viruses are present in various sizes and shapes (**Figure 2**), but are composed of two vital components i.e., a core of genetic material, either RNA or DNA and a protein coat, capsid. A virion comes in four different shapes i.e. spherical, helical,

**Figure 2.** *Types of viruses.*

polyhedral and complex Coronaviruses have positive stranded RNA (+ssRNA) with crown like structure possessing spike glycoproteins on the envelop [12].
