Introduction 

Trichinosis is a parasitic zoonotic infection because it can be transferred from animals to humans. This infection affects close to 10,000 people around the world every year, mostly populations in regions with mild to moderate weather. This infection is caused when someone eats meat contaminated with the worm Trichinella larvae or eggs. When these meats are not properly cooked or eaten raw, they become a great source of infection, for example, meat from pigs. Humans and animals, both domestic and wild, can get infected and may transmit the parasitic worm to others through their faeces.¹ 

Individuals with trichinosis experience symptoms like vomiting, diarrhoea, abdominal and body pain, fever, swelling of the face and puffy eyes, and discomfort.^2,3

Importance of Public Health Measures

Trichinosis is a serious burden on global health because of its mode of transmission and the potential danger it poses to people affected. For this reason, it is necessary to employ public health measures to address the infection and its transmission to reduce its negative impact on affected communities. These measures include: preventing the consumption of the Trichinella parasite through food by cooking at high temperatures or freezing at a specific temperature to inactivate the parasite, regulating and monitoring animal feeds and educating customers to practice safe food handling.^4,5

Surveillance and monitoring

Tracking and reporting cases

This involves passive ways to detect disease and report identified cases to the country's health services system. For instance, the United States utilises a surveillance system known as the National Notifiable Diseases Surveillance System (NNDSS) to collect information on reported cases of trichinosis.⁶

Disease outbreak investigation

Monitoring the outbreak of trichinosis is necessary to ensure the health and safety of the affected populations. This method involves using microscopic devices to spot the parasite in the contaminated meat sample, or using ELISA, which means Enzyme-linked Immunosorbent assay, to detect Trichinella using antibodies. There are biological procedures that can be utilised in identifying different types of Trichinella such as Biological procedures can be utilised to identify the approaches and the PCR technique (Polymerase Chain Reaction). These several not only help in determining the parasite but also help in understanding how the infection spreads and the impact of the disease.⁷

Identifying populations at great risk

Populations at great risk are those who feed on raw or undercooked meat from domestic animals (e.g., Swine, horse), game animals (e.g., boar, bear, seal), and reservoir animals of trichinella (e.g., raccoon, dog, fox).⁸ Programs should facilitate the monitoring of areas with a high frequency of trichinosis and the consumption of such animals. 

Food safety control measures

Establishing programs aimed at examining and testing meat

In areas in Europe, programs are executed to ensure that meat containing the trichinella parasite does not enter the food chain. This is done by ensuring that all animals killed for consumption meet the requirements through control testing.⁹ Similarly, the U.S Food Safety and Inspection Service (FSIS) needs a solid structure to help in determining if Trichinella is dangerous by classifying it into two hazards: a hazard reasonably likely to occur (RLTO) and not reasonably likely to occur (NRLTO). This is necessary as it will help ensure strict monitoring and compliance with all checks.¹⁰

Safe meat handling and processing practices

Standard practices should be implemented, such as the Hazard Analysis and Critical Control Point (HACCP) systems, which include processes that control Trichinella and aid in the identification and maintenance of documentation. However, the Food Safety and Inspection Service (FSIS) recommended the use of methods that can eliminate the parasite from infected meat products, such as heating, freezing, curing, high-pressure processing (HPP) and irradiation.¹¹ 

Enforcing regulations on the trading of meat products

There should be laws and policies for strict control of trichinosis by mandating control checking of slaughtered animals, and these laws should ensure that all policies are adhered to. For example, the U.S. Trichinae Certification Program promotes adherence to good production practices (GPPs), which help reduce the risks among pigs by ensuring that their feed is properly checked and of high quality and that biosecurity measures are implemented against rodents.¹¹

Public awareness and education

Some studies show that consuming wild game meats is a serious source of trichinosis infection, therefore enhancing the need to address the consumption rate through education. The United States has a reduced rate of trichinosis, and this is due to certain changes made in its actions towards improving public health. It includes changes in domestic pork production and education on safe meat handling and processing.⁶ 

Educating consumers about proper cooking temperatures

People who purchase and consume pork and the meats of other animals exposed to trichinosis must be educated on the significance of cooking these meats to a certain temperature to eliminate the trichinella larvae. The recommended temperature required is between 60 - 77 Celsius.^12,13

Promoting hygiene in meat handling and preparation

Educative programs and campaigns that emphasise the importance of upholding hygiene behaviours while handling and preparing raw meats of vulnerable animals by using separate kitchen utensils, to prevent cross-contamination. Also, such campaigns should facilitate sessions to address handwashing and sanitation of surfaces that come into contact with raw meats.¹² 

Awareness campaigns for hunters and farmers

An awareness campaign should educate hunters and farmers about the risks of consuming raw and undercooked meats. This should also feature programs that focus on the importance of good field dressing, processing and cooking practice for wild game animals to minimise the transmission of Trichinella.¹⁴

Veterinary and agricultural interventions

Regulating animal feed to prevent the spread of infection in livestock

Establishing monitoring of animal feeds to ensure they do not contain by-products of infected animals, which could introduce trichinella into the livestock. Additionally, there should be rules that abolish feeding domestic pigs with raw and undercooked meats or scraps, as it is known to be a key path for trichinella transmission. Hence, they should be properly cooked at recommended temperatures to remove potential parasites.⁴

Controlling pig farming practices

In raising pigs, one has to stop exposing them to wildlife to prevent them from eating dead animals infected with the trichinella worm. Therefore, controlling what is within the environment where the pigs are reared is beneficial as it reduces the exposure they have to external animals and rodents, which are a source of the parasite, thereby lowering the infection rates.⁸

Implementing biosecurity measures on the farm

Setting up biosecurity measures such as fencing to keep wildlife out of the farm, cleaning of equipment and facilities, and regular health checks of domestic animals, will help prevent the entry and spread of Trichinella. To make sure that farmers uphold measures, they need to be educated on the dangers linked to the spread of the parasite and how to properly practice biosecurity measures within their farms.⁸

Emergency response to the outbreak

Fast-tracking sources of infection is important in mitigating trichinosis outbreaks. This could be done by identifying contaminated food products, tracing where the meat was obtained from, and assessing handling and processing practices that may have led to contamination. After this, all contaminated products will be recalled, and areas will be quarantined.

Medical management and support

Diagnosing trichinosis earlier is key in preventing the worsening of the parasitic infection in affected individuals. When it is confirmed that a person or an animal has the parasite, treatment should commence immediately by using anthelmintics, glucocorticosteroids and antiparasitic medications such as albendazole or mebendazole as the first treatment option. Although when there is a trichinella parasitic cyst in the muscle tissues, it may be difficult for the antiparasitic medications to remove it, it can help reduce the symptoms experienced.^3,8 To help manage the pain, analgesics like non-steroidal anti-inflammatory drugs can be given.

Collaborative efforts from the health organisations

To solve the problem of trichinosis as a public health burden health organisations such as the World Health Organization (WHO), Food and Agriculture Organization (FAO), and World Organization for Animal Health (WOAH) have to come together to create interventions that will target the spread of the parasite and treatment of infected individuals and animals. Hence, they have designed a guideline highlighting the disease distribution, management, prevention and control. This will help inform public health experts and institutions.

Conclusion

Public health interventions that promote the prevention of Trichinella through proper food handling practices, regulation of animal feed sources, rigorous inspection processes for meats intended for human consumption, consumer education initiatives on best cooking procedures, and certification programs help ensure the safety of livestock and humans from trichinosis.

These approaches underscore the critical role of public health interventions in mitigating this parasitic disease's impact on human populations and agricultural sectors worldwide.