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BORDETELLA(WHOOPING COUGH)
KING OF COUGH!!!
G.HARIPRASAD M.Sc.,(Med micro),M.phil.,Lecturer in Microbiology Department of Microbiology Thoothukudi Govt. Medical College Thoothukudi
GENERAL FEATURES:
• GRAM NEGATIVE SMALL, OVOID COCCOBACILLI.
• FORMS THUMB PRINT APPEARANCE ON NUTRIENT AGAR.
• COLONIES RESEMBLES “BISECTED PEARLS” OR “MERCURY DROPS” APPEARANCE.
VIRULENCE FACTORS:
• AGGLUTINOGEN• PERTUSIIS TOXIN (PT)• FILAMENTOUS
HEMAGGLUTININ• ADENYLATE CYCLASE• HEAT LABILE TOXIN• TRACHEAL CYTOTOXIN• LIPOPOLYSACCHARIDE.
PERTUSSIS TOXIN
PATHOGENESIS
• STAGE 1: CATARRHAL STAGE – INSIDIOUS ONSET
WITH LOW GRADE FEVER WITH DRY IRRITATING COUGH.
• STAGE 2: PAROXYSMAL STAGE – VIOLENT SPASMS
OF CONTINOUS COUGHING FOLLOWED BY A LONG INRUSH OF AIR INTO THE EMPTY LUNGS WITH A CHARACTERISTIC WHOOP.
• STAGE 3: CONVALESCENCE – FREQUENCY AND
SEVERITY OF COUGHING GRADULALLY DECREASE.
Entry through inhalation of droplet nuclei.
LABORATORY DIAGNOSIS
• SPECIMEN: Throat swab & sputum.• CULTURE: Bordet–Gengou Medium Charcoal agar • SEROLOGY: Agglutination
Immunofluroscence ELISA
CHARCOAL AGAR
BORDET-GENGOU MEDIUM
Pertussis toxoid – PTCombined toxoid – DPT
Erythromycin, Chloramphenicol, Cotrimoxazole Ampicillin.
TREATMENT
PROPHYLAXIS