Name the causative agents of the following diseases. How are they transmitted from the patient to a healthy person?
a) Common cold
b) Influenza
c) Hydrophobia
d) Dengue fever
e) Viral hepatitis

a) Common cold  
The common cold is primarily caused by viruses, with the most common being rhinoviruses. Other viruses such as coronaviruses, adenoviruses, and respiratory syncytial viruses (RSV) can also be responsible.  
Transmission occurs through the aerosol route when an infected person coughs or sneezes, releasing respiratory droplets containing the virus. It can also spread by direct contact with contaminated surfaces or through hand-to-hand contact with an infected person, followed by touching the face, especially the eyes, nose, or mouth.

b) Influenza  
Influenza is caused by influenza viruses, primarily types A, B, and C. Type A is the most commonly associated with seasonal flu outbreaks.  
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