The bovine respiratory syncytial virus (BRSV) primarily affects the respiratory system of cattle, leading to a range of observable symptoms. Recognizing these signs is crucial for early detection and management.
Common Clinical Signs of BRSV Infection
Cattle infected with BRSV often display a combination of general and respiratory-specific symptoms. These can vary in severity depending on the individual animal's immune status and the presence of secondary infections.
Here are the key symptoms associated with BRSV:
- Fever: One of the most common indicators is a significant elevation in body temperature, typically ranging from 40–42ºC (104–108ºF).
- Listlessness: Affected animals often appear lethargic, lacking energy and enthusiasm.
- Decreased Feed Intake: A noticeable reduction in appetite and the amount of feed consumed is a common symptom, leading to potential weight loss.
- Increased Respiratory Rate: Animals may exhibit rapid or labored breathing as the virus impacts their lungs and airways.
- Cough: A persistent cough, which can range from dry to moist, is a classic sign of respiratory irritation.
- Nasal Discharge: Secretions from the nostrils, which can be clear, cloudy, or even purulent, are often observed.
- Lacrimal Discharge: Watering eyes or discharge from the eyes may also be present.
For a clearer overview, the symptoms can be summarized as follows:
| Symptom | Description |
|---|---|
| Elevated Body Temperature | Fever of 40–42ºC (104–108ºF) |
| Behavioral Changes | Listlessness, reduced activity |
| Appetite Loss | Decreased feed intake |
| Respiratory Distress | Increased respiratory rate, visible labored breathing, coughing |
| Discharge | Nasal and lacrimal (eye) discharge |
These symptoms can progress, and in some cases, lead to more severe respiratory distress, especially if secondary bacterial infections occur. For more detailed information on bovine respiratory diseases, you can refer to resources like the Merck Veterinary Manual.
