Swine enteric coronaviruses remain a global challenge, threatening food security and public health through rapid mutation, cross-species transmission, and vaccine failure.
Swine enteric coronaviruses (SECoVs)—including transmissible gastroenteritis virus (TGEV), porcine epidemic diarrhea virus (PEDV), porcine deltacoronavirus (PDCoV), and swine acute diarrhea syndrome coronavirus (SADS-CoV)—cause severe intestinal disease in pigs. Piglets are most vulnerable, with mortality rates reaching nearly 100% in some outbreaks. These viruses damage intestinal cells, leading to diarrhea, dehydration, and rapid weight loss.
A study published in the journal Animals underscores how these viruses remain antigenically distinct, meaning infection with one does not protect against another. Their ability to mutate and recombine quickly complicates control efforts and raises concerns about cross-species transmission.
Historical outbreaks illustrate the scale of losses. China reported over one million piglet deaths in 2010, while the US lost more than eight million piglets in 2013, costing up to USD 1.8 billion. In 2017, SADS-CoV killed more than 20,000 piglets in China.
PEDV remains the most widespread SECoV, with variant strains dominating globally. PDCoV has spread across Asia and the Americas, while SADS-CoV remains largely confined to China but shows potential for cross-border transmission.
SECoVs spread mainly through the fecal–oral route, but aerosol, milk-borne, and even semen transmission have been documented. Their resilience in the environment allows prolonged survival, enabling indirect spread between farms. Co-infections with other pathogens worsen disease severity and create opportunities for viral recombination.
Evidence suggests SECoVs may cross species barriers. PDCoV has been detected in children in Haiti, confirming natural human infection. SADS-CoV replicates efficiently in human cells, underscoring its zoonotic potential. These findings highlight the importance of One Health surveillance that integrates animal and human monitoring.
Traditional diagnostic methods are slow, but molecular tools such as RT-PCR, digital droplet PCR, and CRISPR-based assays now enable faster, more sensitive detection. Portable isothermal methods show promise for field use.
Vaccine development is ongoing, with mRNA-based and virus-like particle platforms under study. However, antigenic diversity limits current vaccine effectiveness, particularly against PEDV variants. Multivalent vaccines targeting conserved viral regions are seen as the best path forward.
Swine enteric coronaviruses continue to evolve, challenging existing control measures and threatening both animal health and food security. Strengthened farm biosecurity, improved vaccine strategies, and integrated genomic surveillance are essential to reduce risks and prepare for potential zoonotic spillovers.
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AUTHORS
Bifet Gracia Farm & Nedap – Automated feeding in swine nurseries
The importance of Water on pig farms
Fernando Laguna Arán
Microbiota & Intestinal Barrier Integrity – Keys to Piglet Health
Alberto Morillo Alujas
Impact of Reducing Antibiotic use, the Dutch experience
Ron Bergevoet
The keys to successful Lactation in hyperprolific sows
Mercedes Sebastián Lafuente
Addressing the challenge of Management in Transition
Víctor Fernández Segundo
Dealing with the rise of Swine Dysentery
Roberto M. C. Guedes
Actinobacillus pleuropneumoniae – What are we dealing with?
Marcelo Gottschalk
The new era of Animal Welfare in Pig Production – Are we ready?
Antonio Velarde
Gut health in piglets – What can we do to measure and improve it?
Alberto Morillo Alujas
Interview with Cristina Massot – Animal Health in Europe after April 2021
Cristina Massot
Differential diagnosis of respiratory processes in pigs
Desirée Martín Jurado Gema Chacón Pérez
