They are active only when they are inside a living host cell.
Active viruses are causing a disease at this time. Some can become dormant for a time and can be reactivated. Examples are cold sores and shingles.
They are not active and do not make new viruses.
Remaining healthy is important if a person wishes to live longer, or be active for longer periods of time. Viruses are very tricky to treat, because they live within blood cells, there are only few antiviral medications around.
when a virus enters a cell and is active, it cause the host cell to make new viruses, which destroy the host cell.
Hidden viruses include rootkits, bootkits, and stealth viruses that hide their presence on a system to evade detection. Active viruses include file infectors, macro viruses, and polymorphic viruses that infect files or use different code patterns to avoid detection.
There are no active viruses that affect Mac OS X.
When it is inside a living cell.
unitedairlines.com is as safe as any other reputable travel website. The airlines says their site is very secure and at current time do not have any active viruses related to their site.
an active virus enters a cell and is active it causes the host cell to make new viruses, which destroy the host cell. a latent viruses is some viruses may be latent viruses. a latent virus enters a cell and its hereditary material may become part of the cell's hereditary materials.
A hidden virus is known in the words in its name "HIDDEN virus". It hides and stays inactive. The active virus is also known in its name too "ACTIVE virus". The two viruses have different ways on spreading it own kind throughout the host or hosts.
There are no active viruses that attack Mac OS X.