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Updated: Apr 28, 2026
Author Spotlight: Advancing Therapeutics to Treat Vibriosis in Humans and Aquatic Organisms
Published on: May 31, 2024
Insights
Recent advances in heartworm disease management include updated canine guidelines, evaluating macrocyclic lactone efficacy for heartworm prevention and treatment, and the role of Wolbachia in filarial disease pathogenesis.
Area of Science:
- Veterinary Parasitology
- Infectious Diseases
- Canine Health
Background:
- Heartworm disease (Dirofilaria immitis) remains a significant threat to canine health.
- Advances in understanding and managing heartworm infections are crucial for veterinary practice.
- The role of Wolbachia endosymbionts in filarial nematodes requires further investigation.
Purpose of the Study:
- To present recent advancements in the diagnosis, prevention, and management of heartworm disease in dogs.
- To evaluate the efficacy of macrocyclic lactones in heartworm chemoprophylaxis and adulticide therapy.
- To explore the biological association between Wolbachia and filarial nematodes and their role in disease pathogenesis.
Main Methods:
- Review of the updated 2003 American Heartworm Society guidelines for heartworm management.
- Comparative analysis of the "soft-kill" adulticidal and prophylactic activity of macrocyclic lactones (ivermectin, milbemycin oxime, moxidectin, selamectin).
- Overview of Wolbachia endosymbiont discovery, phylogeny, and its association with filarial nematodes.
Main Results:
- Updated guidelines incorporate new research on chemoprophylaxis, adulticide therapy, and serologic testing.
- Ivermectin demonstrated the highest efficacy in prolonged prophylactic dosing, followed by injectable moxidectin and selamectin, with milbemycin oxime being the least effective.
- Evidence suggests Wolbachia plays a significant role in the immunopathogenesis of filarial diseases in both humans and animals.
Conclusions:
- The 2003 American Heartworm Society guidelines provide a comprehensive update for heartworm control strategies.
- Macrocyclic lactones vary in their prophylactic and "soft-kill" adulticidal efficacy, necessitating careful selection.
- Understanding the Wolbachia-filarial nematode relationship is critical for developing novel therapeutic strategies against filarial diseases.
Abstract:
This compilation of articles consists of four papers presented at the 19th International Conference of the World Association for the Advancement of Veterinary Parasitology (WAAVP) (held in New Orleans, LA, USA, on 10–14 August 2003) in a symposium session titled “ Recent Advances in Heartworm Disease,” organized and chaired by JohnW. McCall and Jorge Guerrero. The first paper(Guerrero) covered the American Heartworm Society’s most recent revision of their guidelines for the diagnosis, prevention, and management of heartworm infection in dogs, based on new research and clinical experience, particularly in the areas of heartworm chemoprophylaxis, adulticide therapy,and serologic testing and retesting. The entire updated 2003 “Guidelines” are presented herein.One paper (McCall) reviewed the “soft-kill” adulticidal and “safety-net” (reach-back, retroactive,clinical prophylactic) activity of prolonged dosing of prophylactic doses of macrocyclic lactones,concluding that ivermectin is the most effective in this way, milbemycin oxime is the least effective,and the activity of injectable moxidectin and selamectin lies between that of ivermectin and milbemycin oxime. The two remaining papers provided an overview of the discovery, rediscovery,phylogeny, and biological association between Wolbachia endosymbionts and filarial nematodes(Genchi and co-authors) and compelling evidence that Wolbachia may play a major role in the immunopathogenesis of filarial diseases of man and animals (Kramer and co-authors).
