Prevention and Control of Peste des Petits Ruminants (PPR): Vaccination, Biosecurity, and Disease Management

Peste des Petits Ruminants (PPR) continues to pose a major threat to sheep and goat production because of its high morbidity, mortality, and economic impact. Effective disease management depends not on a single intervention but on a coordinated strategy that combines timely diagnosis, vaccination, surveillance, biosecurity, and supportive care. Prompt implementation of these measures is essential for limiting disease spread and reducing production losses, particularly in endemic regions. 

Building an Effective PPR Control Strategy 

Successful PPR control begins with rapid and accurate diagnosis. Early identification of infected animals enables timely implementation of vaccination and disease control measures before extensive transmission occurs. The availability of reliable diagnostic kits, serological surveillance, and appropriate infrastructure strengthens disease monitoring and supports more effective control programmes¹. 

In areas free from PPR, stamping-out policies may be implemented. However, where the disease is endemic, control relies primarily on rapid diagnosis or surveillance, followed by prompt vaccination programmes. Immunoenzymatic assays, particularly ELISA, offer practical advantages for large-scale screening because they are reliable, relatively inexpensive, and quick to perform, making them valuable tools for monitoring local infection status and supporting eradication efforts². 

Vaccination: The Cornerstone of Prevention 

Vaccination remains the primary method of preventing PPR. Earlier control programmes successfully used tissue culture rinderpest (TCRP) vaccine because of the antigenic similarity between PPR and rinderpest viruses. However, its use was discontinued worldwide following the eradication of rinderpest³. 

Currently, tissue culture live attenuated vaccines prepared from the Nigerian strain (Nig. 75/1) are widely used. These vaccines induce long-lasting immunity of up to three years and have demonstrated protection in approximately 98% of vaccinated sheep and goats, including pregnant animals. Their principal limitations include heat sensitivity and the inability to differentiate vaccinated animals from naturally infected animals². 

Recombinant vaccines, developed by incorporating PPR virus glycoprotein genes into Capripoxvirus, provide protection against both PPR and sheep or goat pox, making them particularly valuable in regions where mixed infections occur². Marker vaccines have also been developed to facilitate differentiation between naturally infected and vaccinated animals through modified viral constructs². 

Maintaining vaccine efficacy requires careful handling. Freeze-dried vaccines remain stable for at least two years at 2–8°C and for several years at –20°C. Once reconstituted, the vaccine should be used within 30 minutes, highlighting the importance of maintaining an uninterrupted cold chain until administration³. 

Surveillance, Biosecurity, and Disease Management 

Vaccination alone cannot achieve effective disease control. Good hygiene, sanitation, and strict quarantine measures remain essential components of disease prevention. Continuous surveillance supports early recognition of infection, allowing rapid implementation of vaccination programmes and reducing opportunities for further spread. 

In Egypt, annual vaccination is carried out before the seasonal increase in disease occurrence, typically in September. Vaccination is provided free of charge for small ruminants and is implemented through ring vaccination around infection foci, with compulsory vaccination during epidemics². 

Supportive Care During Outbreaks 

No specific antiviral treatment is available for PPR. Clinical management therefore focuses on minimizing complications and improving animal recovery. Long-acting oxytetracycline or chlortetracycline may be administered to control secondary bacterial infections, while antidiarrheal medication and supportive therapy are recommended for five to seven days. Dietary supplementation with natural antioxidants such as Nigella sativa (black cumin) or multi-nutrient antioxidants has also been described to support immune function and help reduce secondary bacterial infections². 

Practical Clinical Insights 

Effective PPR control requires integrating several complementary measures rather than relying on vaccination alone. Early laboratory confirmation, systematic surveillance, appropriate vaccine storage and administration, strict biosecurity, and supportive management of affected animals collectively strengthen disease control programmes. Applying these strategies consistently can help reduce disease transmission, limit economic losses, and support long-term control of PPR in sheep and goat populations. 

References 

1. Soltan MA, Abd-Eldaim MM. Emergence of peste des petits ruminants virus lineage IV in Ismailia Province, Egypt. Infection, Genetics and Evolution. 2014 Dec 1;28:44-7. https://www.academia.edu/download/90383148/j.meegid.2014.08.01620220828-1-1ox8o2e.pdf 

2. Mahmoud MA, Ghazy AA, Shaapan RM. Diagnosis and Control of Peste des Petits Ruminants Disease in Small Ruminants: A Review. World's Veterinary Journal. 2022;12(2):214-20. https://cyberleninka.ru/article/n/diagnosis-and-control-of-peste-des-petits-ruminants-disease-in-small-ruminants-a-review 

3. World Organization of Animal Health (OIE) and Food and Agriculture Organization (FAO) (2015). Global strategy for the control and erradication of PPR. Available at: http://www.fao.org/3/a-i4460e.pdf