What are the most common infectious diseases in South Africa?

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Last updated: August 8, 2026 • View editorial policy

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Most Common Infectious Diseases in South Africa

The most common infectious diseases in South Africa are HIV/AIDS, tuberculosis (including drug-resistant TB), and malaria, which collectively represent the highest burden of morbidity and mortality in the region.

Primary Disease Burden

Based on WHO-informed surveillance data, South Africa faces a concentrated epidemic of three major infectious diseases 1:

HIV/AIDS

  • One in ten adults with HIV globally harbor drug-resistant strains before treatment initiation
  • One in two children infected with HIV in Africa carry drug-resistant strains 1
  • HIV remains the top risk factor driving disease burden when considering unsafe sex as the transmission route 2
  • HIV seroprevalence in antenatal clinic attenders reached 7.6%, with higher rates in certain provinces 3
  • Strong associations exist between HIV and HSV-2 seropositivity 4

Tuberculosis

  • 7.3% of the 1.06 million TB cases reported in Africa had rifampicin resistance or were multidrug-resistant TB in 2018 1
  • Drug-resistant TB carries an 18% mortality rate due to limited treatment options 1
  • TB shows complex interactions with HIV infection, creating a synergistic epidemic 5
  • Smoking increases susceptibility to TB, particularly in HIV-infected patients 5

Malaria

  • Sub-Saharan Africa accounts for 93% of the 228 million malaria cases and 94% of the 405,000 annual malaria deaths worldwide 1
  • Drug resistance monitoring is critical for control efforts
  • Vector dynamics and insecticide resistance complicate prevention strategies

Secondary Infectious Disease Burden

Sexually Transmitted Infections

Beyond HIV, South Africa has significant STI burden 3, 4:

  • Gonorrhea accounts for 71-85% of male urethral discharge presentations 4
  • Chlamydia detected in 13-24% of urethral discharge cases 4
  • Bacterial vaginosis is the most common cause of vaginal discharge (36-46%) 4
  • Trichomoniasis affects 19-34% of women with vaginal discharge 4
  • Syphilis and chancroid cause ulcerative infections in 5-15% of asymptomatic clinic attenders 3

Respiratory Infections

  • Pneumonia and influenza-like illness are common reasons for healthcare consultation 6
  • Public clinics are the primary point of care for respiratory syndromes 6
  • Pharmacies are frequently consulted for respiratory diseases (16-28% of cases) 6

Vaccine-Preventable Diseases

  • 30 million yearly infections among children under 5 years in Africa 1
  • Pneumonia and measles pose considerable threats with potential for nearly 500,000 deaths annually 1

Other Notable Infections

  • Foodborne diseases cause nearly 1,200 disability-adjusted life years per year 1
  • Neglected tropical diseases including echinococcosis (most prevalent), bilharzia, leprosy, and mycetoma 7
  • Non-tuberculous mycobacteria (particularly Mycobacterium avium complex) are increasingly recognized, especially in HIV-positive individuals 8

Critical Context

The "four colliding epidemics" framework describes South Africa's disease burden 2:

  1. HIV and tuberculosis (dual epidemic)
  2. Chronic illness and mental health
  3. Injury and violence
  4. Maternal, neonatal, and child mortality

Healthcare Access Barriers

Common barriers preventing care-seeking include 6:

  • Insufficient time (7-20% of patients)
  • Lack of medications at facilities (4-8% of patients)
  • 32-35% of illness episodes result in no consultation with licensed medical providers

Geographic Disparities

Inequalities in mortality and life expectancy increased from 1990-2007 due to HIV/AIDS differences, then decreased from 2007-2019 with improved HIV treatment 2. However, economically advantaged provinces continue to show greater healthcare system performance gains 2.

Clinical Pitfalls

  • Do not assume TB is the only mycobacterial infection: Non-tuberculous mycobacteria are frequently misdiagnosed as TB, leading to inappropriate treatment and increased mortality 8
  • Screen for drug resistance: With high rates of drug-resistant HIV and TB, empiric treatment without resistance testing risks treatment failure 1
  • Consider co-infections: HIV patients have significantly higher rates of TB, STIs, and other opportunistic infections requiring simultaneous management 4, 5

References

3
Research

Sexually transmitted diseases in South Africa.

Genitourinary medicine, 1996

5
Research

Lung diseases in South Africa: an overview.

Novartis Foundation symposium, 2006

8
Research

Non-Mycobacteria Tuberculosis in Africa: A Literature Review.

Ethiopian journal of health sciences, 2023

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.