Key Takeaways
Short answer: Cicadas are not known to carry or transmit diseases to humans or pets. They do not bite or sting, and they are not venomous.
- Public health organizations and entomologists find no evidence of cicada-borne illness.
- Allergic reactions and rare food safety concerns are possible but uncommon.
- Noise, shed exoskeletons, and root damage from nymphs are the main practical concerns.
Below we clarify what cicadas are, review relevant biology and risk evidence, and provide practical guidance for yard and garden management.
What Are Cicadas
Cicadas are insects in the order Hemiptera, known for their loud singing and prominent emergence cycles. Periodical cicadas in North America have synchronized 13- or 17-year life cycles, while annual cicadas emerge each summer. Adults have large eyes, transparent wings, and hollow, needle-like mouthparts used only to drink xylem from tree roots. They do not chew fabric, wood, or skin, and they do not feed on fruits or vegetables in a way that damages commercial crops.
Cicada Life Cycle Overview
Nymphs develop underground for years, feeding on tree root sap. When conditions are right, they tunnel upward, molt into winged adults, reproduce, and die within a few weeks. They are not strong fliers and typically stay close to their host trees. Understanding this life cycle helps contextualize interactions with humans, pets, and property.
Do Cicadas Carry Diseases
Current scientific and public health evidence indicates that cicadas do not carry or transmit diseases to humans or pets. Unlike mosquitoes, ticks, or some flying insects, cicadas are not known to harbor pathogens that cause viral, bacterial, or parasitic illness. This assessment comes from entomologists and agencies such as the EPA and CDC, which note no cicada-borne disease link in their guidance.
Evaluating the Evidence
Multiple monitoring and research programs have found no association between cicadas and disease transmission. Periodical cicada emergence has been studied for centuries, and no outbreak of cicada-vectored illness has been documented. While any insect can mechanically carry germs on its body, there is no meaningful evidence that this leads to human or animal disease in the case of cicadas.
What Health Agencies Say
Regulatory and public health organizations generally state that cicadas are not a health threat in terms of disease. Their primary impacts are acoustic, aesthetic, and horticultural. People with severe allergies or respiratory sensitivities may react to high insect densities, but this is not the same as an infectious disease risk.
Potential Health Concerns Related to Cicadas
Although cicadas do not spread disease, they can prompt other considerations. These are typically minor and manageable. Factoring them into risk assessments supports informed decisions for yards and outdoor activities.
Allergic Reactions and Sensitivities
Some individuals may experience allergic symptoms from handling cicadas or from heavy airborne cast skins and debris. Symptoms can include skin irritation, itching, or respiratory discomfort. These reactions stem from insect proteins or shed exoskeletons rather than an infectious process.
Food Safety Considerations
In regions where cicadas are consumed, food safety guidance emphasizes sourcing them from pesticide-free areas and cooking them thoroughly. As with any novel food, there is a small risk of allergic reaction. People with shellfish or insect allergies should consult a healthcare professional before eating cicadas.
- Allergic potential: Possible but uncommon; cease consumption if adverse reactions occur.
- Pesticide exposure: Avoid collecting from treated lawns, roadsides, or industrial zones.
- Proper preparation: Cook cicadas to recommended temperatures to reduce food safety risk.
Comparison with Disease-Carrying Insects
Placing cicadas alongside insects known to transmit illness clarifies their risk profile. The table below summarizes key contrasts in behavior and disease relevance.
| Insect | Disease Risk to Humans | Primary Interaction Concerns |
|---|---|---|
| Cicadas | None known; not disease vectors | Noise, shed exoskeletons, root nymph tunneling |
| Mosquitoes | High; arboviruses (West Nile, Zika, dengue) | Biting, blood-feeding, indoor proximity |
| Ticks | High; bacterial and viral diseases (Lyme, anaplasmosis) | Attach to skin, blood-feeding, outdoor vegetation |
| Some Flies (e.g., tsetse) | High; parasitic and bacterial diseases | Blood-feeding, bites, habitat overlap |
This comparison underscores that cicadas differ fundamentally from recognized disease vectors both in biology and public health impact.
Pest Status and Property Impacts
Cicadas are not considered pests in the sense of spreading illness or infesting indoor spaces. Their presence can be noisy and leave shed exoskeletons, but they do not damage home structures. In yards, nymph tunneling may mildly affect young trees, prompting targeted protection strategies when needed.
Yard and Garden Management
Homeowners can protect small or newly planted trees by using fine-netted tree guards during emergence periods or by delaying heavy pruning until after adults finish laying eggs. In most landscapes, cicada activity causes only temporary, cosmetic effects and does not justify chemical treatments.
- Use fine mesh netting on saplings during peak emergence.
- Delay major pruning until after cicada activity subsides.
- Avoid insecticides, which are ineffective and can harm beneficial insects.
When to Seek Professional Guidance
If you experience significant allergic reactions or respiratory symptoms after high exposure to cicadas or their cast skins, consult a healthcare professional for evaluation. For tree health concerns, an ISA-certified arborist can assess damage and recommend appropriate, low-impact care.
Summary
Cicadas do not carry diseases. They pose no known risk of transmitting illness to people or pets. The principal effects of cicada emergence are noise, the presence of shed exoskeletons, and minor root disturbance in lawns and young trees. These impacts are temporary and manageable without resorting to pesticides. Understanding their biology clarifies that cicadas are an ecological event, not a public health threat.
Cicada-related inquiries often arise during peak emergence years. Relying on current scientific consensus and public health guidance can help communities respond calmly and focus on practical, low-risk management steps.