Definition of "heartworms" [heartworms]

• Plural form of heartworm. (noun)

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• "National studies show 12 to 16 percent of pet cats have antibodies to heartworms, meaning they've been exposed to heartworms and are susceptible to HARD."
• "If a pet is on heartworm control, then they don't need to take toxic and painful arsenic injections to control adult heartworms."
• "This has important ramifications for people who live in areas where heartworms are a risk factor for their dogs and cats."