Incubation Period: After exposure to an infected person, it will take about 10 to 12 days for the disease to develop within the exposed person.
Prodromal Phase: The disease is heralded by appearance of the 3 Cs (cough (brassy in character), conjunctivitis (makes the person photo-sensitive/avoid bright light source), coryza/colds, and fever
Exanthem Phase: on the 3rd to 4th day of fever, rashes start to appear from the head (face, nasal bridge, nape) then spread downwards (cephalo-caudal fashion)
Convalescence: When rashes reach the lower extremities, fever disappears, and then desquamation takes place also from head downwards
The person is communicable between 4 days before and 4 days after appearance of the rash.