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VIRUS EPIDEMIOLOGY (PATTERN OF VIRAL DISEASE (ENDEMIC (RARE DISEASE),…
VIRUS EPIDEMIOLOGY
PATTERN OF VIRAL DISEASE
ENDEMIC
RARE DISEASE
EPIDEMIC
COMMON DISEASE WITH SUDDEN [+] IN NO. OF CASES
SPORADIC
RARE DISEASE WITH OCCASIONAL CASES
PANDEMIC
COMMON DISEASE GLOBALLY
INFECTIVITY
MEASURED VIA:
BASIC REPRODUCTIVE RATIO
NO. OF 2RY CASES THAT WILL ARISE FROM 1RY CASES IF PATHOGEN IS INTRODUCED TO SUSCEPTIBLE COMMMUNITY
ATTACK RATE
NO. OF ILL CASES/NO. EXPOSED
DETERMINANTS
DURATION OF VIRAL SHEDDING
ROUTE OF TRANSMISSION
VIRAL SHEDDING
HOST SUSCEPTIBILTY
PATHOGENICITY
ABILITY OF PATHOGEN TO CAUSE DISEASE
ILLNESS RATE =ILL CASES/ NO.INFECTED
VIRULENCE
MEASURE OF SEVERITY ONCE DISEASE OCCURS
CASE FATALITY RATIO= FATAL CASES/TOTAL CASES
SOURCE OF INFECTION
HUMAN TO HUMAN
ANIMAL TO HUMAN
SEROPREVALANCE
PREVELANCE OF POPULATION WITH A ANTIBODY AGAINST A PATHOGEN
RESERVOIR OF INFECTION
ROUTES OF ENTRY