Video Experimental Relacionado
Updated: Jul 11, 2026

08:10
Production of High-Titer Infectious Influenza Pseudotyped Particles with Envelope Glycoproteins from Highly Pathogenic H5N1 and Avian H7N9 Viruses
Published on: January 15, 2020
Infección H5N1 del tracto respiratorio y más allá: un estudio de patología molecular
Jiang Gu1, Zhigang Xie, Zhancheng Gao
1Infectious Disease Centre, Peking University, Beijing, China. jianggu@bjmu.edu.cn
Lancet (London, England)
|October 2, 2007
Resumen
El virus de la gripe aviar H5N1 infecta más que los pulmones, extendiéndose a órganos como el cerebro y la tráquea. Este estudio también encontró evidencia de transmisión de la madre al feto del H5N1 a través de la placenta.
Área de la Ciencia:
- Virología Virología.
- Patología Patología Patología.
- Enfermedades infecciosas Enfermedades infecciosas.
Sus antecedentes:
- La gripe aviar H5N1 es una enfermedad infecciosa emergente con alta mortalidad.
- La infección humana por H5N1 causa principalmente síntomas respiratorios, pero puede afectar a otros órganos.
- Investigaciones anteriores sugirieron el potencial del H5N1 para atacar sitios extrapulmonares.
Objetivo del estudio:
- Para investigar la diseminación extrapulmonar del virus de la gripe aviar H5N1 en humanos.
- Para determinar si la infección por H5N1 puede cruzar la barrera placentaria.
- Para identificar órganos específicos y tipos celulares infectados por el H5N1.1.
Principales métodos:
- Análisis post mortem de tejidos de dos pacientes adultos con H5N1 y un feto.
- La hibridación in situ y la inmunohistoquímica para detectar componentes virales.
- Varias técnicas de RT-PCR (RT-PCR, RT-PCR en tiempo real, RT-PCR específico de la hebra, NASBA) para la detección del ARN viral.
Principales resultados:
- Se encontraron secuencias genómicas virales H5N1 y antígenos en los pulmones, la tráquea, las neuronas cerebrales, las células T de los ganglios linfáticos y la placenta.
- Se detectaron secuencias virales, pero no antígenos, en la mucosa intestinal.
- En el feto, el H5N1 se identificó en el tejido pulmonar, las células mononucleares circulantes y los macrófagos hepáticos.
Conclusiones:
- El virus de la gripe aviar H5N1 infecta la tráquea y se disemina a órganos más allá de los pulmones, incluido el cerebro.
- El estudio proporciona evidencia de una posible transmisión de la madre al feto del H5N1 a través de la placenta.
- El H5N1 puede infectar varios tipos de células, incluidas las células epiteliales, las neuronas y las células placentarias.
Videos de Conceptos Relacionados
Influenza
Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
Viral Mutations
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Coronavirus
Coronaviruses, including the severe acute respiratory syndrome coronavirus (SARS-CoV), are enveloped viruses characterized by their single-stranded, positive-sense RNA genome and helical nucleocapsid structure. The hallmark of these viruses is their club-shaped spike (S) glycoproteins that protrude from the viral envelope, facilitating attachment to host cells. Typically, coronaviruses infect the upper respiratory tract, often causing mild or asymptomatic disease. However, certain strains like...
Rabies
Rabies is a lethal zoonotic disease caused by a single-stranded, negative-sense RNA virus of the Lyssavirus genus, within the family Rhabdoviridae. Its primary mode of transmission to humans is through bites or saliva-contaminated scratches from infected mammals such as dogs, bats, raccoons, or foxes. Transmission can also occur if infectious saliva contacts abraded skin or intact mucous membranes, including the conjunctiva.Viral Entry and Early ReplicationOnce introduced at the bite or scratch...
Respiratory Syncytial Virus Disease
Human respiratory syncytial virus (RSV) is a widespread pathogen that primarily targets infants and young children but also poses a serious health risk to elderly and immunocompromised individuals. Belonging to the Pneumoviridae family, RSV is a negative-sense, single-stranded RNA virus within the Pneumovirus genus. Its global health burden is significant, with millions of cases annually resulting in hospitalizations and mortality, particularly in resource-limited settings. Although most...
Viral Recombination
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.

