
Hepatitis A is an infectious disease caused by the hepatitis A virus (HAV), which is an RNA virus belonging to the picornavirus family, and infects primarily humans as its only natural host [1]. HAV is transmitted primarily by the fecal-oral route, through either close contact with infected individuals...

Diphtheria, tetanus, and pertussis are potentially severe bacterial diseases. Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus. Diphtheria causes a thick pseudomembrane covering the back of the throat, which can lead to breathing issues, paralysis, or heart...