A schematic diagram of a single Salmonella typhi cell showing the locations of the H (flagellar),0 (somatic),and Vi (K envelope)antigens
A schematic diagram of a single Salmonella typhi cell showing the locations of the H (flagellar), 0 (somatic), and Vi (K envelope) antigens
■Endotoxin ■A variety of plasmids Resistance:Live 2-3 weeks in water.1-2 months in stool.Die out quickly in summer Resistance to drying and cooling
◼ Endotoxin ◼ A variety of plasmids ◼ Resistance: Live 2-3 weeks in water. 1-2 months in stool. Die out quickly in summer Resistance to drying and cooling
Epidemiology continues to be a global health problem ■ areas with a high incidence include Asia,Africa and Latin America affects about 6000000 people with more than 600000 deaths a year.80%in Asia. sporadic occur usually,sometimes have epidemic outbreaks
Epidemiology ◼ continues to be a global health problem ◼ areas with a high incidence include Asia, Africa and Latin America ◼ affects about 6000000 people with more than 600000 deaths a year. 80% in Asia . ◼ sporadic occur usually, sometimes have epidemic outbreaks
High endemicity Medium endemicity Sporadic outbreaks
Source of infection Cases and chronic carriers Cases discharge from incubation,more in 2~4 weeks after onset,a few (about 2~5%)last longer than 3 months chronic carrier Typhoid Mary
Source of infection Cases and chronic carriers Cases discharge from incubation, more in 2~4 weeks after onset, a few (about 2~5%) last longer than 3 months chronic carrier Typhoid Mary