Is the blood count high in encephalitis?

Written by Tang Li Li

Neurology

Updated on September 16, 2024

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Not all cases of encephalitis show an increase in blood counts. Elevated blood counts in encephalitis generally occur in bacterial infections, such as the most common pyogenic meningitis. This can cause a significant increase in blood counts, predominantly with neutrophils. Tuberculous meningitis can also show elevated blood counts, but not as prominently as pyogenic meningitis. In cases of viral infection, such as the common herpes simplex virus infection, patients might experience a decrease in blood counts. This is characterized by a reduction in the total number of white blood cells, a lower proportion of neutrophils, and a possible increase in lymphocyte proportion. If the patient has a concurrent lung infection or other bacterial infections at different sites, there might be an increase in blood counts, which can mask the blood abnormalities originally caused by the viral infection.

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Written by Tang Li Li

Neurology

1min 46sec

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How is encephalitis caused?

Encephalitis generally falls into two categories: one is infectious inflammation caused by pathogenic infections, and the other is immune inflammation caused by abnormalities in immune mechanisms. Among these, the infectious type is the most common, including viral encephalitis, viral meningitis, tuberculous meningoencephalitis, purulent meningitis, and cryptococcal meningitis, which are associated with infections by viruses, bacteria, Mycobacterium tuberculosis, and Cryptococcus, respectively. Additionally, abnormalities in the immune system often cause autoimmune encephalitis, as well as multiple sclerosis and neuromyelitis optica when involving the brain, and acute disseminated encephalomyelitis, all of which are types of autoimmune encephalitis. The treatment approaches for these two types of encephalitis are different. For pathogen-induced cases, treatment primarily targets the pathogens: antiviral drugs for viral encephalitis, antibiotics for bacterial encephalitis, anti-tubercular therapy involving multiple drugs for Mycobacterium tuberculosis infection, and antifungal drugs, such as amphotericin B, for cryptococcal meningitis. For immune-mediated encephalitis, treatments generally involve immunosuppressants, high-dose corticosteroids, or intravenous immunoglobulins.

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Written by Tang Li Li

Neurology

1min 18sec

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How is encephalitis in children diagnosed?

If a child presents with fever, headache, nausea, vomiting, or even convulsions and seizures, it is necessary to be vigilant about the possibility of encephalitis. It is advised to seek medical attention in pediatrics or neurology to conduct a thorough examination. First, an MRI of the brain should be carried out to observe if there are any abnormal signals in the meninges or any damage within the brain substance. Second, cerebrospinal fluid analysis via lumbar puncture is essential for diagnosing encephalitis, as encephalitis patients often show significant abnormalities in cell count and biochemistry of the cerebrospinal fluid, allowing for the identification of different types of infections. Third, an electroencephalogram (EEG) is conducted. While EEG specificity is not high, an affected cerebral cortex in encephalitis patients will show abnormal slow waves. Fourth, routine tests such as a complete blood count should be performed; an elevated blood count can indirectly indicate a potential infection in the patient.

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Written by Zhang Hui

Neurology

1min 25sec

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How is encephalitis diagnosed?

The diagnosis of encephalitis cannot rely solely on auxiliary examinations; it must depend on the patient's medical history, clinical manifestations, and corresponding physical examination. If a patient presents with fever, headache, nausea, vomiting, and signs of nuchal rigidity upon examination, the possibility of encephalitis should be considered. Additionally, severe cases of encephalitis may exhibit seizures, cognitive changes, and personality alterations. Auxiliary examinations mainly include three types: the first type is imaging studies, primarily brain MRI, which can clearly identify the specific areas of the brain affected and determine which brain lobe is damaged. The second important examination is an electroencephalogram (EEG), which can detect diffuse slow waves, especially a significant presence of delta waves, highly indicative of encephalitis. The third important auxiliary examination is lumbar puncture for cerebrospinal fluid analysis; an increase in white blood cells and protein in the cerebrospinal fluid also suggests inflammation within the skull. Therefore, the main auxiliary examinations for encephalitis include MRI, EEG, and lumbar puncture.

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Written by Zhang Hui

Neurology

59sec

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Does encephalitis cause a runny nose?

Encephalitis can potentially cause a runny nose, as it is mainly caused by viral infections. These infections not only invade brain cells, leading to symptoms such as fever, headache, nausea, vomiting, and even seizures related to the nervous system, but can also affect the respiratory tract. If these viruses accumulate in the respiratory tract, particularly in the nasal mucosa, they will definitely cause symptoms such as a runny nose, cough, expectoration, and sore throat. Therefore, it is evident that patients with encephalitis can exhibit symptoms of upper respiratory tract infections. Moreover, some patients initially present with respiratory symptoms, such as a runny nose, before the viruses enter and infect the brain cells. Patients with encephalitis must receive timely treatment, primarily symptomatic treatment to prevent complications, along with antiviral medication for targeted treatment. Most patients have a good prognosis.

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Written by Tang Li Li

Neurology

1min 7sec

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Is the blood count high in encephalitis?

Not all cases of encephalitis show an increase in blood counts. Elevated blood counts in encephalitis generally occur in bacterial infections, such as the most common pyogenic meningitis. This can cause a significant increase in blood counts, predominantly with neutrophils. Tuberculous meningitis can also show elevated blood counts, but not as prominently as pyogenic meningitis. In cases of viral infection, such as the common herpes simplex virus infection, patients might experience a decrease in blood counts. This is characterized by a reduction in the total number of white blood cells, a lower proportion of neutrophils, and a possible increase in lymphocyte proportion. If the patient has a concurrent lung infection or other bacterial infections at different sites, there might be an increase in blood counts, which can mask the blood abnormalities originally caused by the viral infection.