Gastroenteritis – GCCNurseJobs.com Clinical Guide

Viral Causes

Norovirus

Most common cause in adults. Highly contagious (10–100 particles infectious). Incubation 12–48h. Vomiting predominates. Lasts 1–3 days. Alcohol gel INEFFECTIVE — must use soap and water. Cohort nursing mandatory.

Rotavirus

Most common cause in children <5. Watery diarrhoea + vomiting + fever. Can cause severe dehydration in infants. Vaccine available (oral; reduces hospitalisations significantly).

Bacterial Causes

Organism	Source/Features	Treatment Note
Salmonella	Poultry, eggs; bloody diarrhoea	Usually self-limiting; antibiotics if severe/immunocompromised
Campylobacter	Most common bacterial cause UK; poultry	Usually self-limiting; azithromycin if severe
E. coli O157:H7	Undercooked beef; bloody diarrhoea	AVOID antibiotics — increases HUS risk
Shigella	Faecal-oral; dysentery	Ciprofloxacin if severe
Cholera	Rice-water stools; rapid dehydration	Doxycycline + aggressive ORS/IV fluid

Dehydration Assessment

Parameter	Mild (<5%)	Moderate (5–10%)	Severe (>10%)
Skin turgor	Normal	Reduced	Tenting
Mucous membranes	Moist	Dry	Very dry/parched
Eyes	Normal	Slightly sunken	Sunken
HR / BP	Normal	HR elevated	Tachycardia + hypotension
Urine output	Normal	Reduced/dark	Oliguric/anuric

ORS — First-Line Even for Moderate Dehydration

Oral Rehydration Salts (ORS)

WHO ORS formulation: glucose 75 mmol/L, sodium 75 mmol/L, potassium 20 mmol/L, chloride 65 mmol/L, citrate 10 mmol/L. Osmolarity 245. Use for mild and moderate dehydration. Give 50–100 mL/kg over 4 hours. Commence IV fluids only if vomiting prevents ORS or severe dehydration.

Early Refeeding

Resume normal age-appropriate diet as soon as tolerated. Early refeeding reduces illness duration. Avoid fasting — starving does NOT help recovery. Avoid sugary drinks and carbonated beverages (worsen diarrhoea).

Antibiotic Guidance

Antibiotics NOT routinely recommended

Most gastroenteritis is self-limiting. Routine antibiotics increase resistance and can worsen some conditions (E. coli O157 — increases HUS risk).

USE antibiotics when:

Immunocompromised patient (HIV, chemotherapy, steroids)
Systemic sepsis (bacteraemia)
Cholera → doxycycline (adults)
Shigella → ciprofloxacin
E. coli O157:H7 → AVOID antibiotics (HUS risk)

Infection Control — Norovirus & C. difficile

Alcohol hand gel is INEFFECTIVE against norovirus and Clostridium difficile. Soap and water handwashing is mandatory. Side room isolation, dedicated commode/toilet, PPE (gloves + apron), and environmental decontamination with hypochlorite solution (1000 ppm).

Haemolytic Uraemic Syndrome (HUS)

Triad: microangiopathic haemolytic anaemia + thrombocytopenia + acute kidney injury. Occurs 5–10 days after E. coli O157:H7 infection, especially in children. Antibiotics increase risk. Management: supportive — IV fluids, dialysis if needed. Monitor FBC, U&E, LDH daily.

Notifiable Diseases

The following must be notified to public health authorities:

Cholera, typhoid, paratyphoid
Dysentery (Shigella)
E. coli O157 VTEC
Viral hepatitis A & E
Cryptosporidiosis
Notify within 24 hours in most GCC countries

GCC-Specific Risk Factors

Hajj Food-borne Outbreaks

Mass gathering of 2+ million pilgrims in Makkah creates high-risk conditions for food-borne illness. Temperature, communal eating, and catering scale all increase risk. Saudi MOH deploys surveillance teams during Hajj season.

Ramadan Communal Iftar

Large communal Iftar gatherings (breaking fast) in mosques, hotels, and homes increase food safety risks. Buffet-style serving, temperature abuse of cooked foods, and volume cooking elevate food poisoning risk.

Labour Camp Overcrowding

Migrant worker labour camps across GCC (especially KSA, UAE, Qatar) can have suboptimal sanitation. Outbreaks of hepatitis A, norovirus, and typhoid have been reported. Key infection control point for GCC nurses.

SFDA Food Hygiene Regulations

Saudi Food and Drug Authority (SFDA) and equivalents in UAE (ESMA), Qatar (MoPH) regulate food safety. Nurses should be aware of reporting mechanisms for food-borne illness clusters in their facilities.

Antimicrobial resistance is a major concern in GCC. Several GCC countries have historically had high rates of over-the-counter antibiotic dispensing. Nurse education on appropriate antibiotic use for gastroenteritis (self-limiting in most cases) is a priority stewardship message.

GCC summer temperatures can exceed 45°C. Gastroenteritis patients (particularly elderly, children, and outdoor workers) are at extreme risk of severe dehydration. Aggressive ORS and early IV fluid therapy may be needed sooner than in temperate climates.

Key Exam Points

Norovirus = most common in adults; rotavirus = most common in children <5
Alcohol gel INEFFECTIVE for norovirus and C. diff — use soap and water
ORS is first-line for mild AND moderate dehydration
E. coli O157:H7 — NEVER give antibiotics (risk of HUS)
Cholera → doxycycline; Shigella → ciprofloxacin
Antibiotics NOT routine — only for immunocompromised, sepsis, specific pathogens
HUS triad: haemolytic anaemia + thrombocytopenia + AKI

Practice MCQs

1. A 3-year-old with rotavirus gastroenteritis has 6% dehydration. The first-line treatment is:

2. A ward patient has a confirmed norovirus infection. Which hand hygiene method is most appropriate?

3. A child develops bloody diarrhoea after eating undercooked beef and is diagnosed with E. coli O157 infection. Regarding antibiotics:

4. Which gastroenteritis pathogen should be treated with doxycycline in adults?