• Vetiranary Medicine
  • ACVCACVC
  • DVM 360
  • Fetch DVM 360Fetch DVM 360
DVM 360
dvm360 | Veterinary News, Veterinarian Insights, Medicine, Pet Care
dvm360 | Veterinary News, Veterinarian Insights, Medicine, Pet Care
By Role
AssociatesOwnersPractice ManagerStudentsTechnicians
Subscriptions
dvm360 Newsletterdvm360 Magazine
News
All News
Association
Breaking News
Conference Coverage
Education
Equine
FDA
Law & Ethics
Market Trends
Medical
Politics
Products
Recalls
Regulatory
Digital Media
dvm360 LIVE!™
Expert Interviews
The Vet Blast Podcast
Medical World News
Pet Connections
The Dilemma Live
Vet Perspectives™
Weekly Newscast
dvm360 Insights™
Publications
All Publications
dvm360
Firstline
Supplements
Top Recommended Veterinary Products
Vetted
Clinical
All Clinical
Anesthesia
Animal Welfare
Behavior
Cardiology
CBD in Pets
Dentistry
Dermatology
Diabetes
Emergency & Critical Care
Endocrinology
Equine Medicine
Exotic Animal Medicine
Feline Medicine
Gastroenterology
Imaging
Infectious Diseases
Integrative Medicine
Nutrition
Oncology
Ophthalmology
Orthopedics
Pain Management
Parasitology
Pharmacy
Surgery
Toxicology
Urology & Nephrology
Virtual Care
Business
All Business
Business & Personal Finance
Hospital Design
Personnel Management
Practice Finances
Practice Operations
Wellbeing & Lifestyle
Continuing Education
Conferences
Conference Listing
Conference Proceedings
Resources
CBD in Pets
CE Requirements by State
Contests
Veterinary Heroes
Partners
Spotlight Series
Team Meeting in a Box
Toolkit
Top Recommended Veterinary Products
Vet to Vet
  • Contact Us
  • Fetch DVM360 Conference
  • Terms and Conditions
  • Privacy
  • Do Not Sell My Information
  • About Us

© 2023 MJH Life Sciences and dvm360 | Veterinary News, Veterinarian Insights, Medicine, Pet Care. All rights reserved.

Advertisement
By Role
  • Associates
  • Owners
  • Practice Manager
  • Students
  • Technicians
Subscriptions
  • dvm360 Newsletter
  • dvm360 Magazine
  • Contact Us
  • Fetch DVM360 Conference
  • Terms and Conditions
  • Privacy
  • Do Not Sell My Information
  • About Us
  • MJHLS Brand Logo

© 2023 MJH Life Sciences™ and dvm360 | Veterinary News, Veterinarian Insights, Medicine, Pet Care. All rights reserved.

Heartworm prevention: The questionable zero mosquito factor

April 6, 2016
Matthew Miller, DVM, MS, DACVIM (cardiology)

Even areas with fewer mosquitos can be hotbeds of heartworm infection.

(Photo courtesy of the American Heartworm Society)

Q. We don't see a lot of mosquitoes in my practice area. Is it really necessary to push prevention?

Dr. Matthew MillerA. Veterinarians often refer to their locales as being “endemic” or “nonendemic” for heartworm. For those in many of the Western and Mountain states, the assumption is that if heartworm historically hasn't been a problem in the region, there's no reason to recommend yearly testing or heartworm prevention now. I moved to Phoenix-which is in a supposedly nonendemic region-less than 18 months ago. During that time, I've performed several surgeries for heartworm caval syndrome on dogs that had never left the Phoenix area.

Radiating factors

It is true that the incidence of heartworm is lower in this and other parts of the country than others, but it is clear that heartworm is very much a threat. In my experience, where incidence of a disease is thought to be lower, so is vigilance. When many unprotected pets live in such an area, just one heartworm-positive animal can have a large impact. To understand why, we first need to examine the factors that cause heartworm to spread.

> Reservoir of infection. To be a reservoir, the heartworm-positive animal needs to have circulating microfilariae. The culprit could be the dog next door or a feral animal, such as a coyote or fox. Here in Phoenix, as in many urban areas, we have a high coyote population, and coyotes are an important potential reservoir for heartworm. Infected animals brought in from other parts of the country are another important reservoir.

Advertisement

> Mosquito vectors. Mosquitoes that feed on a host animal with microfilariae are soon in a position to transmit infective larvae to an unprotected animal. Most mosquitoes don't travel long distances; instead they spend most of their lives in a 400-meter circle. But a lot can happen within that circle. If an owner has a reservoir in the form of an infected neighborhood dog, or if the owner lives near a golf course where coyotes hang out in the evening or even sleep behind the house, all it takes is the presence of mosquitoes attracted by standing water on the property to put mosquitoes in proximity to infected host animals.

> Access. Infected mosquitoes need access to unprotected pets. Unless a dog is receiving a heartworm preventive, there's risk. Whether the dog only goes outside for brief bathroom breaks or enjoys long daily hikes, it is exposed to mosquitoes. Taking precautions that limit mosquito exposure certainly helps, but these precautions can't completely eliminate the risk of heartworm transmission.

> Protection. As noted, the above factors can be almost completely nullified if pets receive year-round prevention. The American Heartworm Society (AHS) guidelines also recommend 12-month prevention to control other pathogenic or zoonotic parasites and to enhance compliance.

One small step for canine kind

As veterinarians, our sphere of control is really our practice area, but within that area, we have several important responsibilities. First, we need to recommend year-round use of preventives. Second, when we do diagnose an infected dog with circulating microfilariae, we need to take prompt action to treat it. By eliminating the microfilariae, we decrease the risk that that dog will serve as a source of heartworm infection to other dogs.

We may not be able to do everything to reduce risk-we can't give preventives to coyotes or prevent infected dogs from moving into a neighborhood. But each time we work with a client to reduce the risk of heartworm transmission in a 400-meter circle where an infected mosquito might live, we're making a positive difference for the pets in our practice area.

This question and others are the focus of a new series of 15-minute recorded talks designed to offer practical information on heartworm prevention, diagnosis and treatment. The “Eye on Heartworm” videos, which are made available by the AHS, can be found at https://www.heartwormsociety.org/veterinary-resources/veterinary-education/videos. 

Related Content:

MedicalBreaking NewsParasitology
UC Davis oral surgeons repair kitten’s severe cleft palate
UC Davis oral surgeons repair kitten’s severe cleft palate
Tips and tricks for diagnosing canine osteoarthritis early
Tips and tricks for diagnosing canine osteoarthritis early
Performing surgery on dogs with GDV
Performing surgery on dogs with GDV

Advertisement

Latest News

Managing wounds in pet patients

Spectrum of care: protocols to support pet owners’ budgets

How to support women while still running a successful business

The Vets expands to Raleigh, NC

View More Latest News
Advertisement