Long live the worms: methods for maintaining and assessing the viability of intestinal stages of Parascaris spp. in vitro.

The research explores the in vitro upkeep and viability assessment of the equine ascarid parasite, Parascaris spp. Results show that the worm’s viability can be significantly improved by maintaining it in Roswell Park Memorial Institute-1640 media.

Equine Ascarid Parasite and its In Vitro Maintenance

• The study focused on Parascaris spp., an equine ascarid parasite. In general, helminth parasites are maintained in vitro, or outside a living organism, to conduct various molecular, pharmaceutical, and immunological studies.
• However, techniques to determine the in vitro environmental and nutritional requirements of Parascaris spp. have been lacking. This study aimed to establish these requirements.
• The study made use of 1045 worms across 212 cultures. The worms, sourced from naturally infected foals, were promptly placed in culture flasks containing 200ml of culture medium.

Experimenting with Media Types and Environmental Conditions

• Various types of media, nutrient supplementation, and environmental conditions were tested in the study.
• The survival and condition of the worms were assessed with a scoring system which evaluated their movement, or motility.
• It was found that worms maintained in a specific media—Roswell Park Memorial Institute-1640—had significantly improved viability compared to any other media.

Nutrient Supplementation and Viability Improvement

• Similarly, all media types supplemented with the nutrients tested in the experiment showed a much better viability rate in the worms.
• Another significant result was that an instrument called a platform rocker significantly improved the viability of the worms.

Importance of the Study

• This critical study is the first one to both examine the requirements for maintaining Parascaris spp. in vitro and evaluate their viability using a movement-based scoring system.
• Understanding the in vitro requirements and an objective viability assessment method would aid further research and therapeutic development for managing and eradicating the equine ascarid parasite.