SARS-CoV-2 in wastewater: Challenges for developing countries.

Area of Science:

• Environmental Science
• Public Health
• Infectious Diseases

Background:

• The COVID-19 pandemic has highlighted the potential for SARS-CoV-2 transmission through fecal-oral routes.
• Detection of SARS-CoV-2 in human waste, even after respiratory clearance, indicates a persistent viral shedding risk.
• Developing countries face heightened risks due to inadequate waste disposal, poor sanitation, and limited clean water access.

Purpose of the Study:

• To review and correlate data on wastewater treatment, sanitation, and healthcare infrastructure in low- and middle-income countries (LMICs).
• To assess the risk of fecal-oral transmission of SARS-CoV-2 in LMICs.
• To identify limitations of sewage-based COVID-19 surveillance in regions with underdeveloped infrastructure.

Main Methods:

• Systematic review of existing literature and data on wastewater treatment and sanitation in LMICs.
• Correlation analysis between sanitation status, healthcare infrastructure, and potential SARS-CoV-2 fecal-oral transmission risks.
• Evaluation of the feasibility and limitations of wastewater-based epidemiology for COVID-19 surveillance in LMICs.

Main Results:

• Inadequate waste disposal and poor sanitation in LMICs significantly increase the risk of fecal-oral SARS-CoV-2 transmission.
• Limited access to clean water exacerbates public health challenges.
• The absence of proper sewerage systems hinders effective COVID-19 surveillance through sewage monitoring in many LMICs.

Conclusions:

• Addressing ineffective waste disposal and improving sanitation are critical for mitigating SARS-CoV-2 fecal-oral transmission risks in developing countries.
• An integrated approach involving awareness, prevention, and mitigation strategies is essential at all levels.
• Global and local efforts are required to overcome the unique challenges posed by the pandemic in resource-limited settings.