Paratyphoid fever

• Disease description (causes and symptoms)

  • Cause: Acute intestinal and systemic infection caused by Salmonella paratyphi infection (transmitted via the fecal–oral route, through contaminated food or water, or contact with patients/carriers).
  • Pathophysiology summary: Bacteria entering orally penetrate the intestinal mucosa, causing hematogenous spread and multiplying in the reticuloendothelial system, including the lymphatic tissues and spleen. Damage to the intestinal mucosa, particularly the Peyer’s patches, increases the risk of intestinal bleeding and perforation.
  • Main symptoms: Fever (persistent high fever) after an incubation period of 1–2 weeks, headache, abdominal pain, diarrhea or constipation, rose spots, splenomegaly, and fatigue. Some people also experience nausea, vomiting, and generalized malaise.
  • Diagnosis: Confirmation of Salmonella paratyphi through clinical findings and blood and stool cultures (and urine culture when necessary). Blood tests may show changes in white blood cell counts and elevated inflammatory markers.

• Treatment methods (standard treatment, medications·procedures·lifestyle management, precautions)

  • Basic treatment
    • Fluid and electrolyte replacement (oral replacement for mild cases; intravenous infusion for severe cases).
    • Symptomatic treatment (antipyretics, antiemetics, etc.).
  • Antibiotic treatment
    • Antibiotics are administered for patients with severe disease, high-risk groups (infants and young children, older adults, and immunocompromised people), persistent bacteremia, or suspected complications.
    • Representative medications: Selection depends on local resistance patterns (for example, ciprofloxacin-class antibiotics are restricted in many areas because of high resistance rates; third-generation cephalosporins, such as ceftriaxone, or azithromycin are frequently used). Treatment usually lasts 7–14 days and is adjusted according to the clinical course.
  • Infection control
    • Patient isolation or hygiene management (particularly isolation of food handlers).
    • Disinfection of facilities and items used by the patient, such as toilets.
    • Follow-up stool testing is necessary to identify carriers (in accordance with public health authority guidelines).
  • Complications and precautions
    • Possible complications: Intestinal bleeding, intestinal perforation, sepsis, and, rarely, osteomyelitis or meningitis. Hospitalization and surgical treatment may be necessary if complications occur.
    • Precautions during self-care: Drink sufficient fluids, maintain personal hygiene (handwashing), and do not handle food (follow public health guidelines). Complete the antibiotic course as prescribed.

• Checklist before an outpatient visit (items·records and examples of questions)

  • Items to bring
    • A list of current medications and allergies, including recent antibiotics.
    • Records of recent fever, the number and characteristics of bowel movements, whether vomiting occurred, and the location and severity of abdominal pain.
    • Recent travel history, group meals or food exposures, and whether you have had contact with a patient or work at a childcare facility or food service establishment.
    • Previous test results, if available, such as blood test and culture results.
  • Things to check before the visit
    • The duration of the fever and the highest temperature, and symptoms of dehydration, such as decreased urination or dizziness.
    • Whether there is bloody stool, black stool, or severe abdominal pain (signs suspicious for perforation)—in such cases, visiting an emergency room immediately is recommended.

• Examples of general questions to ask the doctor

  • What is the expected duration of this antibiotic treatment, and what are its common side effects?
  • Is hospitalization or intravenous treatment necessary in this situation?
  • When can I resume normal activities, such as going to work or school or handling food?
  • Please tell me what signs may indicate complications.

• Examples of disease-specific questions

  • How many tests do I need to undergo to confirm whether I am a carrier (until my stool tests are negative), and what are the criteria for returning to food-handling work?
  • Considering the local antibiotic resistance situation, which antibiotic do you recommend, and are there alternative medications?

(Note: It is important to follow local antibiotic resistance patterns and the public health authorities’ guidelines on isolation and testing.)