Rabies Onset Symptoms

May 28, 2021 Source: Cainiu Health

Dr. Wang Jihong

Introduction

1. Prodromal phase: Patients commonly experience nonspecific symptoms such as anorexia, headache, low-grade fever, nausea, and vomiting. 2. Excitative (furious) phase: Patients exhibit prominent hydrophobia and photophobia, along with agitation and autonomic hyperactivity. 3. Paralytic phase: Patients transition from agitation to calmness and develop flaccid paralysis of the limbs, ultimately leading to death.

Rabies virus is a neurotropic virus with a strong affinity for the nervous system. Once infection occurs, the virus first replicates locally at the wound site, then gradually infiltrates neural tissue and ultimately reaches the central nervous system (CNS), from where it disseminates to various organs throughout the body. So, what are the clinical manifestations of rabies? Below is an explanation.

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Symptoms of Rabies Onset

1. Prodromal Phase

This is the initial stage following a bite by a rabid dog. Patients commonly experience nonspecific symptoms such as anorexia, headache, low-grade fever, nausea, and vomiting. A characteristic symptom of rabies also appears during this phase: pruritus (itching) or a foreign-body sensation at the bite site—indicating that the rabies virus has begun to invade neural tissue.

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2. Excitative (Furious) Phase

During this stage, classic signs of rabies infection become clearly evident. Patients exhibit marked agitation and hyperexcitability, along with hallmark features including hydrophobia (fear of water) and photophobia (fear of light). Autonomic dysfunction is prominent, manifesting as excessive salivation, sweating, and tachycardia. Patients appear markedly different from their usual selves and may experience muscle spasms or convulsions. This phase typically lasts 1–3 days.

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3. Paralytic (Dumb) Phase

This is the final stage of rabies infection. Following the excitative phase, patients gradually become calmer; however, this phase is brief and signals imminent death. Patients transition from agitation to profound lethargy and develop flaccid paralysis—characterized by diminished responsiveness, muscular weakness, and stupor. Ultimately, death results from paralysis of the respiratory muscles and bulbar (medullary) dysfunction.

The above outlines the clinical manifestations of rabies onset. We hope this information is helpful to you.

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Are there any specific symptoms of rabies?

Rabies has clear and specific symptoms, mainly characterized by abnormal sensations during the prodromal stage and typical hydrophobia, aversion to wind, and other signs during the excitation stage. The disease progresses rapidly and is highly distinctive, with an extremely high fatality rate once symptoms appear. After being bitten, scratched, or exposed to a suspected infected animal, medical attention should be sought immediately regardless of whether symptoms have developed. Symptoms typically appear from several days to dozens of days after exposure.