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Updated: May 14, 2026

In Vivo Imaging Systems (IVIS) Detection of a Neuro-Invasive Encephalitic Virus
Published on: December 2, 2012
[Influenza A pH1N1 meningoencephalitis: a case report]
Pablo Melonari1, Carolina Rodríguez Saá, Héctor Abate
1Servicio de Infectología, Hospital Pediátrico Humberto Notti, Mendoza, Argentina. pa_melonari@yahoo.com.ar
Abstract:
The influenza virus causes epidemics and pandemics with high morbidity and mortality. According to the World Health Organization, this virus causes 3-5 million cases of severe illness and 250,000 to 500,000 deaths each year. The disease is mainly respiratory and the most common complications are pneumonia, exacerbation of underlying diseases and less frequently respiratory complications. We report a 6-year-old patient with meningoencephalitis due to a new influenza A (IA), strain pH1N1, with viral documentation in cerebrospinal fluid (CSF). We provide detailed clinical, laboratory and imaging of the case, which responded favorably to sequels. Knowledge of this form of presentation is of great clinical and epidemiological significance due to the limited scientific evidence published internationally.
Insights
A rare case of meningoencephalitis caused by a novel influenza A (IA) pH1N1 strain in a child was documented. This influenza complication, identified in cerebrospinal fluid (CSF), showed a favorable response to treatment.
Area of Science:
- Neurology
- Infectious Diseases
- Virology
Background:
- Influenza A virus (IA) causes significant global morbidity and mortality annually.
- Typical influenza complications are primarily respiratory, such as pneumonia.
- Neurological complications of influenza are less common but can be severe.
Observation:
- A 6-year-old patient presented with meningoencephalitis.
- The condition was linked to a novel influenza A (IA) pH1N1 strain.
- Influenza virus was detected in the patient's cerebrospinal fluid (CSF).
Findings:
- The case demonstrated a rare presentation of influenza A (IA) as meningoencephalitis.
- Viral documentation in CSF confirmed the etiological agent.
- The patient experienced a favorable clinical outcome with no lasting sequels.
Implications:
- Highlights the potential for influenza A (IA) to cause severe neurological complications.
- Underscores the importance of considering influenza in cases of meningoencephalitis, even in the absence of typical respiratory symptoms.
- Contributes valuable data to the limited international scientific evidence on influenza-associated neurological disease.
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