Marina was tidying up the yard at dusk when she felt something lightly touch her arm. It was a bat, which fell to the ground shortly after and began fluttering. She saw no bite marks or scratches, just that quick touch. Uncertain, she sought medical care the same day and was advised to begin the rabies vaccination schedule. She was surprised: "but it didn't even bite me." The answer is precisely the central point of this text.

"The data and clinical case cited in this article are fictional and are merely illustrative, serving to facilitate understanding of the topic addressed."

Why the bat is a special case

With dogs and cats, the risk of rabies is usually linked to bites, scratches, or contact of saliva with broken skin or mucous membranes. With bats, however, the guidance in Brazil is more cautious: any direct contact with the animal, even without visible skin lesions, is considered an exposure that warrants beginning prophylaxis. This happens because a bat bite can be small, superficial, and go unnoticed, and because there is no well-defined incubation period for this animal as there is for other species. For this reason, touching a bat, even though it may seem like harmless contact, is reason enough to seek medical evaluation as soon as possible.

Bite or scratch: here the type of animal changes everything

When contact is a bite or scratch, the conduct depends on which animal caused the wound:

Dog or cat with an owner, healthy and possible to observe for 10 days: in these cases, it is often possible to observe the animal instead of vaccinating immediately. If it remains healthy at the end of this period, the rabies risk is considered ruled out. If the animal becomes ill, dies, or disappears during the observation period, vaccination is started without delay.

Dog or cat without an owner, showing signs of illness, or that cannot be observed: prophylaxis is usually started immediately, without waiting 10 days.

Wild animals (bats, monkeys, foxes, and others) or livestock animals such as cattle and horses in at-risk areas: because it is not possible to safely observe these animals, the general guidance is to start vaccination at the first evaluation.

In addition to the type of animal, the healthcare professional assesses the severity of the wound (location, depth, number of lesions) to decide whether, in addition to the vaccine, it is necessary to also administer serum or anti-rabies immunoglobulin, reinforcement indicated in the most severe cases.

Symptoms when rabies has already established itself in a person

Rabies has a highly variable incubation period, from days to years, but on average about 45 days in humans, potentially shorter in children. Before any more obvious signs appear, there is an initial nonspecific phase, with malaise, low-grade fever, headache, loss of appetite, and often tingling or altered sensation near the bite site. After this phase, the disease progresses to more severe neurological conditions, which may include agitation, confusion, spasms, and in some cases, progressive paralysis. It is a disease with serious progression, and it is precisely for this reason that prevention before symptoms appear is so important.

Warning signs in the animal

It is also worth knowing how to recognize possible signs in dogs and cats: sudden change in behavior (a docile animal becoming aggressive, or an active animal becoming very quiet and hiding), difficulty swallowing, excessive salivation, barking with altered sound, motor incoordination, and in more advanced stages, paralysis. In the case of bats, the animal may show no signs at all, which reinforces why any direct contact with them should already be evaluated.

What to take from this text

If contact was with a bat, even without visible bite marks, seek medical attention to evaluate the vaccine. If it was a bite or scratch from another animal, the type of animal, its apparent health, and the possibility of observation will guide the conduct. When in doubt, the safest course is always to seek medical evaluation quickly: early initiation of prophylaxis is what ensures protection.

This content is informational in nature and does not replace a medical consultation. In case of contact with or bite from an animal, seek medical attention as soon as possible for an individualized evaluation.

Dr. Rebeca Soares Andrade CRM - GO 39335