What I am learning so far.

 From Wikipedia

 1. Viral DNA create lytic cycles causing host cells to lyse and release more viruses into the host.

2.   The lysogenic cycle is when the viral DNA is incorporated into the host genome, allowing it to go unnoticed by the immune system. Eventually, it gets reactivated and enters the lytic cycle. 

Transmission methods[edit]

Within the host, pathogens can do a variety of things to cause disease and trigger the immune response. Microbes and fungi cause symptoms due to their high rate of reproduction and tissue invasion. This causes an immune response, resulting in common symptoms as phagocytes break down the bacteria within the host. Some bacteria, such as H. pylori, can secrete toxins into the surrounding tissues, resulting in cell death or inhibition of normal tissue function. 

  Viruses, however, use a completely different mechanism to cause disease. Upon entry into the host, viral pathogens enter the lytic cycle; this is when the virus inserts its DNA or RNA into the host cell, replicates, and eventually causes the cell to lyse, releasing more viruses into the environment.

  The lysogenic cycle, however, is when the viral DNA is incorporated into the host genome, allowing it to go unnoticed by the immune system. Eventually, it gets reactivated and enters the lytic cycle, giving it an indefinite “shelf life” so to speak.^[6]