Final answer:
Mononucleosis is caused by the Epstein-Barr virus (EBV), also known as human herpesvirus 4 (HHV-4), which resides within B lymphocytes and can remain dormant as a latent infection. It's commonly transmitted via saliva and is associated with symptoms such as fever, sore throat, and swollen lymph nodes.
Step-by-step explanation:
The correct option is A:
The organism that causes mononucleosis is Epstein-Barr virus (EBV), also known as human herpesvirus 4 (HHV-4).
Epstein-Barr virus is responsible for a variety of human diseases, including mononucleosis, which is often characterized by fever, sore throat, swollen lymph nodes, and fatigue. It primarily affects lymphocytes, leading to symptoms such as fever, sore throat, fatigue, and enlarged lymph nodes. EBV is a widespread virus that nearly all people have been exposed to at some point in their childhood.This virus primarily infects B lymphocytes and can remain dormant in a latent state for an extended period.
Infectious mononucleosis, commonly referred to as mono or the "kissing disease," is typically transmitted through saliva. The EBV also has an association with more serious conditions such as Burkitt lymphoma, highlighting its potent impact on human health. While exposure to EBV is common and most people encounter it during childhood, the virus can cause significant disease primarily when the immune response is not well-controlled.