On April 19, 2011, Map Maker was added to the American version of Google Maps, allowing any viewer to edit and add changes to Google Maps. This provides Google with local map updates almost in real time instead waiting for digital map data companies to release more infrequent updates. 2012
The basic process of viral infection and virus replication occurs in 6 main steps. 1  Adsorption-virus binds to the host cell. 2  Penetration-virus injects its genome into host cell. 3  Viral Genome Replication-viral genome replicates using the host's cellular machinery.
There are several different types of viruses, including DNA, RNA, and retroviruses. DNA viruses usually replicate by taking over the cell's DNA, whereas RNA viruses tend to replicate in the cytoplasm. Retroviruses transcribe their DNA into host DNA via reverse transcription- an example of this is HIV. The body has several defense mechanisms against viruses. The body's first line of defense is the innate immune response, which is non-specific and defends the body against a variety of threats.