Rabies
Rabies is a zoonotic disease of warm-blooded animals is caused by a Rhabdovirus belonging to Lyssavirus. It is a bullet-shaped virus.
Mode of transmission-
Bites and licks on abrasions or intact mucus membrane by infected animals. Saliva is the vehicle of transmission. Bites,Licks,corneal graft,salivary aerosol can cause transmission.
Common sources of infection-
Rabid dogs, Monkey, Cat, Mice, Vampire bats.
Worldwide- Dogs,cats,canines,cattles, even Humans. Skunks,raccoons,vampire bats, …

Introduction-
Giardiasis is the Infection of the upper small intestine caused by a Flagellate Protozoan , Giardia lamblia ( aka G. intestinalis or G. duodenalis).
Epidemiology-

Occurs Worldwide, most abundantly in areas with poor sanitation.
Persons of all ages area affected, but is particularly high among children.

Life Cycle and Pathogenesis-
Organism occurs in faeces. Only the cyst is infectious, trophozoites are destroyed by gastric acidity. …

BETA LACTAM ANTIBIOTICS:
are the most popularly used antibiotics. They are  any antibiotic agent that contains a β-lactam chain in the molecular structure. Penicillin is the prototype drug and once was a cure for almost anything. Sir Alexander Fleming discovered Penicillin. It was a miracle discovery in history of Mankind.
Mechanism of Action:
-          Interfere with the synthesis of …

Smallpox is believed to have emerged in human populations about 10,000 BC. The disease killed an estimated 400,000 Europeans each year during the 18th century (including five monarchs), and was responsible for a third of all blindness. Of all those infected, 20�60%�and over 80% of infected children�died from the disease.
During the 20th century, it is estimated that smallpox was responsible …