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Respiratory syncytial virus (RSV) is a single-stranded negative sense RNA virus that belongs to the paramyxovirus family. RSV infections lead to a variety of clinical outcomes ranging from a mild "cold-like disease" to death. Infection is usually more severe in infants and the elderly. RSV is associated with the development and exacerbation of chronic lung conditions including asthma, and it is a major cause of hospitalizations in infants. Because of its clinical relevance, experimental animal models to study RSV in vivo are needed. The most common and accessible animal model in research laboratories is the mouse. However, commonly use RSV strains poorly establish infection in mice and thus titration of the virus from mouse lungs to confirm infection is not sensitive enough to detect early viral infection. Here we discuss in detail how to infect BALB/c mice with RSV and how to detect RSV genomes in the lung using reverse transcription quantitative PCR (RT-qPCR). This method allows detection of viral genomes as early as day 1 post-infection (shown in Figure 2), whereas traditional TCID 50 fails to detect significant virus until after day 2 post-infection. Of note, despite of higher sensitivity, genome RT-qPCR only shows the production of viral genomes and thus positive results for this assay are not proof of production of infectious viral particles.

Respiratory Syncytial Virus Infection in Mice and Detection of Viral Genomes in the Lung Using RT-qPCR