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PubMed This is a summary of 11 peer-reviewed journal articles Updated
Infectious Disease

Is Filariasis Contagious? How It Spreads

At a Glance

No, filariasis is not contagious from person to person. You cannot catch it through touching, hugging, kissing, or sharing utensils. The disease is spread exclusively through the bites of infected insects, like mosquitoes or certain flies, which are required for the parasite to mature and spread.

In this answer

2 sections

01

How the Infection Spreads

02

What This Means for You and Your Family

No, filariasis is not contagious from person to person [1]. You cannot catch the disease from someone who has it through casual or close contact, such as hugging, kissing, touching, or sharing drinks and utensils [1][2]. Expectant mothers also cannot pass the disease directly to their unborn babies [2].

How the Infection Spreads

Filariasis is an infectious disease that can cause physical burdens like swelling or lymphedema, but it requires a “middleman”—an insect vector, such as a mosquito or certain types of flies—to spread from one person to another [3][4].

The life cycle of the filarial parasite is complex and relies entirely on these insects:

  • The Bite: When a mosquito or fly bites a person who has filariasis, it drinks in microscopic, immature worms (called microfilariae) along with the person’s blood [1]. These insects often bite at night or in the evening, depending on the species [5].
  • The Development: The parasite cannot infect another human right away. It must undergo an essential, mandatory growth phase inside the insect’s body over several days or weeks to mature into an infective stage [1][2].
  • The Spread: Once the parasite has matured inside the insect, the mosquito can pass these infective larvae onto the next person it bites [6].

Because this vital growth phase must happen inside the insect, it is impossible to catch the disease directly from another person [2].

What This Means for You and Your Family

If you or a loved one has been diagnosed with filariasis, it is completely safe to be around them. You do not need to isolate the person, use separate bathrooms, or wash their dishes separately [1]. They pose no infection risk to their family members, friends, or caregivers through everyday interactions [2].

It is also important to know that you are not a permanent danger to your community. Anti-parasitic medical treatments work by clearing the immature worms (microfilariae) from your blood [7][8]. By getting treated, you break the cycle of transmission because mosquitoes can no longer pick up the parasite from you.

Along with treatment, preventing the spread of filariasis involves avoiding insect bites in tropical and subtropical parts of Asia, Africa, the Western Pacific, and the Americas where the disease is common [9][10]. This includes using insect repellent, wearing long sleeves and pants, and sleeping under mosquito nets [11][10].

Common questions in this guide

Is filariasis contagious through touching or kissing?
No, filariasis cannot be spread through casual or close contact such as hugging, kissing, touching, or sharing drinks and utensils. It is completely safe to interact normally with someone who has the infection.
Can a pregnant mother pass filariasis to her baby?
No, expectant mothers cannot pass the filariasis infection directly to their unborn babies. The parasite requires an insect middleman to develop and spread.
How does a person catch filariasis?
Filariasis is transmitted through the bite of an infected mosquito or specific type of fly. The insect bites someone with the infection, the parasite develops inside the insect for several days or weeks, and then the insect passes it to the next person it bites.
Will treating filariasis prevent it from spreading to others?
Yes. Anti-parasitic medications work by clearing the immature microscopic worms from your blood. Once they are cleared, mosquitoes can no longer pick up the parasite from you, which breaks the cycle of transmission in your community.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Am I currently carrying microfilariae in my blood?
  2. 2.How soon after starting treatment am I no longer a source of microfilariae for mosquitoes?
  3. 3.Based on where I live or traveled, what type of mosquitoes are transmitting this, and what time of day do they bite?
  4. 4.How do we monitor whether the treatment has successfully cleared the microscopic worms?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

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References

References (11)
  1. 1

    Population genomics of the filarial nematode parasite Wuchereria bancrofti from mosquitoes.

    Small ST, Reimer LJ, Tisch DJ, et al.

    Molecular ecology 2016; (25(7)):1465-77 doi:10.1111/mec.13574.

    PMID: 26850696
  2. 2

    Wolbachia and Lymphatic Filarial Nematodes and Their Implications in the Pathogenesis of the Disease.

    Setegn A, Amare GA, Mihret Y

    Journal of parasitology research 2024; (2024()):3476951 doi:10.1155/2024/3476951.

    PMID: 38725798
  3. 3

    Molecular xenomonitoring highlights post-MDA surveillance priorities for sustained Wuchereria bancrofti elimination in Burkina Faso.

    Rattanapitoon SK, Arunsan P, Thanchonnang C, Rattanapitoon NK

    Tropical medicine and health 2025; (53(1)):148 doi:10.1186/s41182-025-00826-1.

    PMID: 41168903
  4. 4

    Risk factors of lymphatic filariasis in Asia: a systematic review.

    Galgamuwa LS, Hakmanage NM, Fernando S

    BMC infectious diseases 2025; (25(1)):1692 doi:10.1186/s12879-025-12158-w.

    PMID: 41345580
  5. 5

    A review of epidemiology of lymphatic filariasis in Nigeria.

    Waje T, Iliyasu C, Yaki LM, Auta IK

    The Pan African medical journal 2024; (47()):142 doi:10.11604/pamj.2024.47.142.39746.

    PMID: 38933431
  6. 6

    Making sense of sensory behaviors in vector-borne helminths.

    Wheeler NJ, Hallem EA, Zamanian M

    Trends in parasitology 2022; (38(10)):841-853 doi:10.1016/j.pt.2022.07.003.

    PMID: 35931639
  7. 7

    Safety and efficacy of co-administered diethylcarbamazine, albendazole and ivermectin during mass drug administration for lymphatic filariasis in Haiti: Results from a two-armed, open-label, cluster-randomized, community study.

    Dubray CL, Sircar AD, Beau de Rochars VM, et al.

    PLoS neglected tropical diseases 2020; (14(6)):e0008298 doi:10.1371/journal.pntd.0008298.

    PMID: 32511226
  8. 8

    Efficacy, Safety, and Pharmacokinetics of Coadministered Diethylcarbamazine, Albendazole, and Ivermectin for Treatment of Bancroftian Filariasis.

    Thomsen EK, Sanuku N, Baea M, et al.

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2016; (62(3)):334-341 doi:10.1093/cid/civ882.

    PMID: 26486704
  9. 9

    MOSQUITO IDENTIFICATION AND MOLECULAR XENOMONITORING OF LYMPHATIC FILARIASIS IN SELECTED ENDEMIC AREAS IN GIZA AND QUALIOUBIYA GOVERNORATES, EGYPT.

    Abdel-Shafi IR, Shoeib EY, Attia SS, et al.

    Journal of the Egyptian Society of Parasitology 2016; (46(1)):93-100 doi:10.12816/0026153.

    PMID: 27363044
  10. 10

    Potential factors influencing lymphatic filariasis transmission in "hotspot" and "control" areas in Ghana: the importance of vectors.

    Pi-Bansa S, Osei JHN, Frempong KK, et al.

    Infectious diseases of poverty 2019; (8(1)):9 doi:10.1186/s40249-019-0520-1.

    PMID: 30717788
  11. 11

    Health beliefs and health seeking behavior towards lymphatic filariasis morbidity management and disability prevention services in Luangwa District, Zambia: Community and provider perspectives.

    Maritim P, Silumbwe A, Zulu JM, et al.

    PLoS neglected tropical diseases 2021; (15(2)):e0009075 doi:10.1371/journal.pntd.0009075.

    PMID: 33617551

This page provides educational information about filariasis transmission and is not a substitute for professional medical advice. Always consult your healthcare provider for diagnosis and treatment recommendations.

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