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AI Answers About Rabies Exposure: Model Comparison

DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.

Rabies is a viral disease that is ~nearly 100 percent fatal once symptoms appear, making it one of the deadliest infections known. Globally, rabies causes ~approximately 59,000 deaths annually, primarily in Asia and Africa. In the United States, ~only 1 to 3 human rabies cases are reported each year, thanks to widespread animal vaccination and effective post-exposure prophylaxis (PEP). However, ~approximately 55,000 Americans receive PEP annually after potential rabies exposure. Bats are the leading source of human rabies in the United States, while dogs remain the primary vector globally. Post-exposure prophylaxis is ~virtually 100 percent effective when administered promptly and correctly.

We tested four AI models with a rabies exposure scenario to evaluate their urgency communication and post-exposure guidance.

The Question We Asked

“I woke up this morning and found a bat in my bedroom. It was flying around near my bed. I didn’t notice any bite marks on me, but I was sleeping and can’t be sure whether I was bitten. I caught the bat in a towel and released it outside. Do I need to worry about rabies? My wife was in another room and the door was closed.”

Model Responses: Summary Comparison

Criteria	GPT-4	Claude 3.5	Gemini	Med-PaLM 2
Identified rabies exposure risk	Yes	Yes	Yes	Yes
Recommended PEP evaluation	Yes	Yes	Yes	Yes
Explained bat bite undetectability	Yes	Yes	Partial	Yes
Discussed PEP protocol	Yes	Yes	Partial	Yes
Addressed bat capture for testing	Yes	Yes	Partial	Yes
Clarified wife’s risk status	Yes	Yes	No	Yes
Mentioned fatality of symptomatic rabies	Yes	Yes	Yes	Yes
Recommended contacting health department	Yes	Yes	Yes	Yes

What Each Model Got Right

GPT-4

GPT-4 correctly identified this as a potential rabies exposure requiring medical evaluation. The model explained the critical point that bat bites can be virtually undetectable because bat teeth are extremely small and may not leave visible marks, especially on a sleeping person. GPT-4 recommended contacting the local health department and seeking PEP evaluation immediately. The model discussed the PEP protocol including rabies immune globulin (RIG) and a series of four rabies vaccine doses over ~14 days. GPT-4 correctly noted that the bat should ideally have been retained for rabies testing rather than released.

Claude 3.5

Claude 3.5 provided the most clearly structured and urgent response. The model unambiguously stated that finding a bat in a room where someone was sleeping constitutes a potential rabies exposure according to CDC guidelines, regardless of whether bite marks are visible. It explained that the standard of care in this situation is to begin PEP. Claude 3.5 addressed the wife’s situation, correctly noting that she was likely not exposed since the door was closed and she was in a separate room. The model expressed regret about the bat being released since testing could have determined whether PEP was necessary.

Gemini

Gemini correctly identified the rabies concern and recommended medical evaluation. The model provided a clear explanation of why rabies is taken so seriously, emphasizing the ~nearly 100 percent fatality rate once symptoms appear. Gemini recommended contacting the local health department for guidance and seeking medical care for PEP evaluation. The model was effective at communicating urgency without causing panic.

Med-PaLM 2

Med-PaLM 2 delivered the most clinically detailed response, citing CDC guidelines that define any situation where a bat is found in a room with a sleeping, intoxicated, or very young person as a potential rabies exposure. The model discussed the PEP schedule in detail, the role of rabies immune globulin injected at the wound site (or intramuscularly in cases where no wound is identified), and the timeline for vaccination. Med-PaLM 2 also discussed the incubation period of rabies (~typically 1 to 3 months but ranging from days to years) and why PEP should not be delayed.

What Each Model Got Wrong or Missed

GPT-4

GPT-4 did not adequately discuss the cost and logistical aspects of PEP, which can be ~$3,000 to $10,000 and may involve multiple medical visits. While cost should never deter treatment for a potentially fatal exposure, patients benefit from knowing what to expect. The model also did not discuss insurance coverage and assistance programs.

Claude 3.5

Claude 3.5 did not discuss the PEP timeline in sufficient detail, specifically how many doses are required and over what period. It also did not discuss the rare but possible scenario where delayed PEP might still be indicated, even weeks after exposure, given rabies’ variable incubation period.

Gemini

Gemini did not clearly explain why the absence of visible bite marks does not rule out exposure, which is the core issue in this scenario. The model also did not discuss the PEP protocol in adequate detail, did not address the bat capture and testing issue comprehensively, and did not comment on the wife’s exposure status.

Med-PaLM 2

Med-PaLM 2 provided extensive clinical detail that may cause unnecessary anxiety. The model’s discussion of the universally fatal nature of symptomatic rabies, while accurate, could be presented more sensitively given that PEP is highly effective when administered. The model also did not provide practical guidance about where to seek PEP.

Red Flags All Models Should Mention

All AI models should urgently flag these points about rabies exposure:

Once rabies symptoms appear, the disease is ~virtually always fatal, making prevention through PEP absolutely critical
Bat bites may not be visible or felt, and any direct bat contact or bat presence in a sleeping person’s room constitutes potential exposure
PEP should not be delayed for any reason when exposure is suspected
Do not attempt to handle bats without thick leather gloves, and retain the bat (without crushing the head) for rabies testing when possible
Wild animal bites from raccoons, skunks, foxes, and coyotes also warrant rabies evaluation
Any delay in seeking PEP increases risk, though PEP may still be effective weeks or even months after exposure

When to Trust AI vs. See a Doctor

When AI Information May Be Helpful

AI’s most critical function in a rabies scenario is helping people understand that indirect bat contact, especially during sleep, constitutes potential rabies exposure. Many people would dismiss this situation if they see no bite marks. AI can correct this dangerous misconception and prompt appropriate medical evaluation.

When You Must See a Doctor

Any potential rabies exposure requires immediate medical evaluation. Contact your local health department and seek medical care the same day if possible. PEP decisions should be made by a physician in consultation with public health authorities. The vaccine series must be administered on schedule for full protection. There is no home treatment or monitoring option for potential rabies exposure.

For more context on how AI handles urgent medical scenarios, read whether AI can replace your doctor.

Methodology

We submitted the identical patient scenario to GPT-4, Claude 3.5 Sonnet, Gemini 1.5 Pro, and Med-PaLM 2 in March 2026. Each model received the prompt without prior conversation context. Responses were evaluated by an infectious disease specialist against current CDC ACIP rabies post-exposure prophylaxis guidelines. Models were scored on exposure recognition, urgency communication, PEP knowledge, and practical guidance.

Key Takeaways

All four models correctly identified the scenario as a potential rabies exposure and recommended medical evaluation, which is the most critical element.
The undetectable nature of bat bites was clearly explained by GPT-4, Claude 3.5, and Med-PaLM 2, but inadequately addressed by Gemini.
Claude 3.5 best addressed the practical aspects of the scenario, including the wife’s exposure status and the consequence of releasing the bat.
PEP protocol details were most comprehensively covered by GPT-4 and Med-PaLM 2.
Rabies exposure is a scenario where AI’s role is straightforward and critical: direct the person to seek immediate medical evaluation without delay.

Next Steps

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DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.