Murine pneumonia computer virus targets bronchiolar epithelium and leads to severe disease with marked respiratory disease correlates positively with the viral inoculum (Bonville et al.2006; Rosenberg et al.2005). studies with the RSV-infected neonatal lamb are also highlighted. Keywords:Respiratory syncytial computer virus, Neonatal lamb model, Antiviral therapy, Animal model, Infants == Introduction == Human respiratory syncytial computer virus (RSV) is Mubritinib (TAK 165) usually a common cause of respiratory contamination in infants and children worldwide (Hall et al.2013). RSV is usually a ubiquitous computer virus that targets the respiratory system causing rhinitis, bronchiolitis, pneumonia, and occasionally otitis media. Children younger than 5 years of age and individuals over the age of 65 have a higher risk of severe contamination. One surveillance study decided that > 57,000 children under the age of 5 years were hospitalized annually due to RSV-associated acute respiratory illness (ARI) (Hall et al.2009). While contamination of RSV FANCG in immunocompetent adults causes a common cold and mild upper respiratory tract symptoms, the disease outcome can be severe and fatal in preterm infants and children younger than 1 year of age (Hall et al.2013; Rossi et al.2007; Sommer et al.2011). Currently, there is a limited choice of therapeutic compound and no available vaccine for RSV contamination. Numerous studies are conducted in search of preventive methods and treatment options from RSV. Development of such therapeutic compounds and vaccines requires extensive laboratory testing, animal trials in the preclinical stage, and multiple phases of clinical Mubritinib (TAK 165) trials. Establishing a suitable animal model that mimics the RSV contamination in human is usually challenging due to the high degree of specificity of the RSV to its natural host and lack of virulence in other species (Table1). Experimental contamination of RSV in mice and cotton rat has been well established and became a widely use animal model for RSV. These rodent models are employed in many types of RSV studies including the understanding of the viral pathogenesis as well as preventive and treatment trials. In addition to these rodent models, experimental contamination of RSV in larger mammals has been carried out in non-human primates (NHPs) and ruminants. == Table 1. == Features of RSV contamination in human infant compared with lamb, cotton rat, and mice models Neonatal: + Th2 > Th1 (Ripple et al.2010) Adult: ++, Th1 > Th2 (Tripp et al.2001) Neonatal: + Adult: +++ (Tregoning et al.2008) Neonatal: Neutralizing antibody detection > 6 DPI Adult: Neutralizing antibody detection > 5 DPI (Prince et al.1978) Neonatal: IgG2a > IgG1 > IgGa > IgE (Ripple et al.2010) Adult: IgG2a > IgG2b > IgG1 > IgE (Dakhama et al.2005) NDno data In the past decade, an experimental lamb model for RSV contamination was developed and currently a fully established animal model for RSV. This model has now been increasingly used for therapeutic and immunomodulatory trials with promising outcome such as follows: a small molecule fusion inhibitors (Roymans et al.2017), a small molecule replication inhibitor (Sitthicharoenchai, et al.2018), an immunotherapy compound (Larios Mora et al.2018), VEGF (Meyerholz et al.2007), and potassium iodine administration (Derscheid et al.2014a). This review will briefly describe different types of animal models for RSV with comparison with the unique characteristic of the lamb model. In addition, we will provide a general knowledge of the RSV lamb model and current update of the model application. == Components and features of pulmonary airway in lambs == Animal models are considered the bridge between in vitro studies and human clinical trials. Developing animal models for RSV infections is challenging due to the high degree of specificity of the RSV to its natural host and lack of virulence in other species (Bossert and Conzelmann,2002; Schlender et al.2003). The ideal animal model should replicate key features of the disease in humans, including anatomical structure, immunologic responses, clinical signs, and respiratory tract lesions to RSV contamination. The age-related severity outcome of RSV contamination is an additional factor to consider when choosing the proper animal model. Nevertheless, Mubritinib (TAK 165) many concerns and limitations are unavoidable with animal studies including animal husbandry, handling, housing, costs, and ethical issues. The familiarity and appropriate understanding of strengths and weaknesses for each animal model is crucial for constructing research experiments, performing laboratory assessments, and interpretation of the findings. The timeframe of alveologenesis during fetal development differs among certain animal species and human. Alveologenesis in rodents occur after parturition Mubritinib (TAK 165) while ovine and human alveolar development begins prenatally (Alcorn et al.1981; Schittny2017). This development difference makes neonatal rodent models less favorable as a representative for infant lung. Only 2% of all rodent model-based RSV studies have been conducted with infant mice (< 7 days old) (Cormier, et al.2010) and even fewer with infant cotton rats (Prince et al.1978). However, with the ability to manipulate gene expression and abundance of molecular tools available, the use of neonatal mice for immunopathological studies remains to.