General characteristics and classification
Salmonellosis consistently ranks among the top three leading acute bacterial intestinal infections. In clinical practice, it is customary to distinguish several groups of pathologies caused by microorganisms of this genus:
- Typhoid fever and paratyphoid fevers, which are anthroponotic infections.
- Salmonellosis presenting as zoonotic infections and foodborne toxicoinfections.
- Hospital-acquired or nosocomial salmonellosis.
It is important to consider that the causative agents of typhoid fever (S. typhi) and paratyphoid fevers have fundamentally different pathogenic properties and clinical features compared to other salmonelloses.
Role of immunodeficiency and severe forms of infection
In the late stages of immunodeficiency states, particularly in HIV infection, the infectious process acquires an extremely severe and atypical course. The mechanisms of severe complications are associated with the suppression of cellular and humoral immunity, allowing infectious agents to multiply unhindered.
One of the characteristic markers of severe immunodeficiency is continuously recurrent salmonella sepsis. The appearance of such atypical and severe forms requires mandatory screening of the patient for HIV infection as part of the diagnostic process.
Epidemiological features
Salmonellosis incidence is registered year-round, although a marked surge is observed in the summer-autumn period from July to November. The most vulnerable population categories are infants under one year of age and individuals over 70. In economically developed countries, this infection holds a leading position among bacterial gastrointestinal lesions.
Salmonellosis is active in summer (July–November), strikes extreme age groups (infants and the elderly), and progresses to continuous sepsis in immunodeficiency.
Class and exam questions
What groups of diseases are distinguished within the genus Salmonella?
Typhoid and paratyphoid fevers (anthroponoses), salmonellosis as zoonotic infections and foodborne toxicoinfections, and hospital-acquired (nosocomial) salmonellosis are distinguished.
What is the relationship between salmonellosis and HIV infection?
Continuously recurrent salmonella sepsis is included in the list of AIDS-defining conditions and indicates severe suppression of the immune system.
Who is most susceptible to salmonellosis?
The highest susceptibility is demonstrated by children under 1 year of age and elderly people over 70.
What else to study on this topic
- Pathogenesis and mechanisms of development of foodborne toxicoinfections
- Differential diagnosis of salmonellosis and typhoid fever
- Clinical presentation of localized and generalized forms
- Principles of specific and nonspecific prevention
- Features of nosocomial salmonellosis in hospitals
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