Typhoid Fever Vaccine

?Typhoid fever is a dangerous infectious disease.
Typhoid fever is caused by the typhoid bacillus Salmonella Typhi and paratyphoid bacilli (Salmonella paratyphi A and B). The disease onset is typically sudden, characterized by prolonged high fever, headache, fatigue, anorexia, constipation, diarrhoea, dry cough, bradycardia, and potential skin rashes.

However, mild or asymptomatic cases may occur, facilitating easy transmission to others. The average incubation period ranges from 8 to 14 days.
Notably, individuals infected with typhoid fever can transmit the pathogen to others.

The definitive diagnosis of typhoid fever is based on epidemiological characteristics of the endemic region, clinical symptoms, and the isolation of Salmonella bacteria from blood, stool, or other clinical specimens of suspected cases.

?Source of Infection:
While the disease can occur year-round, typhoid fever is most prevalent during the summer. It typically occurs in areas with poor sanitary conditions, particularly those with inadequate water supply, poor drainage systems, and substandard food safety practices.

Patients are the primary source of infection, as they can transmit the pathogen during the incubation period before clinical symptoms manifest. After recovery, patients may continue to shed bacteria into the environment for 2-3 weeks to 2-3 months, posing a high risk of infection to healthy individuals.
Healthy carriers: These are individuals infected with the bacteria who remain asymptomatic but are still capable of transmitting the disease to others.


?Modes of Transmission
Typhoid fever is contracted through the ingestion of contaminated food or water that has not been properly cooked. Subsequently, some infected individuals become carriers, transmitting the pathogen to others. Transmission occurs through direct contact with patients or carriers, or via contaminated waste, hands, or objects.