Study on Causes of Respiratory Disease to the Middle East Respiratory Syndrome-negative Subjects

Middle East respiratory syndrome coronavirus (MERS-CoV) causes severe cases of human respiratory disease. The current outbreak of infection with this virus in South Korea, which began on May 20, 2015, has infected 186 patients and caused 36 deaths within 2 months. In this study, to investigate the viral pathogen causing acute respiratory infections, multiplex/RT-PCR was performed on were obtained from nucleic acid of the Middle East Respiratory Syndrome-negative subjects. Viruses and atypical bacteria were detected in 39 of 337 (11.6%). Frequent viruses were human rhinovirus (n=11, 3.3%), human metapneumovirus (n=9, 2.7%), parainfluenza (n=9, 2.7%) and adenovirus (n=4, 1.2%). Mycoplasma pneumonia (M. pneumonia) was detected in 1.8 % (n=6). Out of 9 human metapneumovirus (hMPV) positive samples, 6 samples were successfully sequenced using F gene. And M. pneumoniae was sequencing of a repetitive region of the P1 gene. Phylogenetic analysis revealed that hMPV clustered into A2b lineage (n=4), B2 lineage (n=2) and M. pneumoniae clustered into two genotypes: Type 1 (n=4), Type 2a (n=2).

Study on Causes of Respiratory Disease to the Middle East Respiratory Syndrome-negative Subjects

Middle East respiratory syndrome coronavirus (MERS-CoV) causes severe cases of human respiratory disease. The current outbreak of infection with this virus in South Korea, which began on May 20, 2015, has infected 186 patients and caused 36 deaths within 2 months. In this study, to investigate the viral pathogen causing acute respiratory infections, multiplex/RT-PCR was performed on were obtained from nucleic acid of the Middle East Respiratory Syndrome-negative subjects. Viruses and atypical bacteria were detected in 39 of 337 (11.6%). Frequent viruses were human rhinovirus (n=11, 3.3%), human metapneumovirus (n=9, 2.7%), parainfluenza (n=9, 2.7%) and adenovirus (n=4, 1.2%). Mycoplasma pneumonia (M. pneumonia) was detected in 1.8 % (n=6). Out of 9 human metapneumovirus (hMPV) positive samples, 6 samples were successfully sequenced using F gene. And M. pneumoniae was sequencing of a repetitive region of the P1 gene. Phylogenetic analysis revealed that hMPV clustered into A2b lineage (n=4), B2 lineage (n=2) and M. pneumoniae clustered into two genotypes: Type 1 (n=4), Type 2a (n=2).

Observations on pathogenicity between A and B subtype of hMPV in mice / 中华微生物学和免疫学杂志

ObjectiveTo investigate the difference of pathogenicity between the two genotypes of human metapneumovirus(hMPV) for the further research.MethodsAt various time after hMPV infection in BALB/c mice,viral titers of lung tissue were measured by real-time RT-PCR,pathology was assessed by a histopathological scoring system,airway responsiveness was assayed by animal lung function monitoring equipment.Pathogenicity was then measured by detailed evaluation through the results above.Results There is no significant difference in weight of mice between control group and experimental group through dynamic monitoring ; though the difference was exists in airway responsiveness and pathological changes of mice between control group and experimental group,the differences were not statistically in airway reaction,pathological changes and virus drops among the three groups of experimental group.ConclusionThere is no difference in pathogenicity between the two subtypes of hMPV in infection of BALB/c mice,viral genotype do not appear to be associated with pathogenicity.

A Case of Human Metapneumovirus Pneumonia in an Immunocompetent Adult Patient Mimicking with Influenza (A/H1N1-2009) Pandemic / 감염과화학요법

The human metapneumovirus virus (hMPV) is a recently described human respiratory pathogen. The virus has usually been associated with upper and lower respiratory tract infections in children. Since most of the available data on the clinical manifestations come from observational studies on children, relatively little is known of emerging hMPV infections in the adult population in Korea. A 32-year old female patient, presenting fever, chills, cough and sputum for 3 days progressed to severe pneumonia during the season of pandemic influenza A/H1N1-2009. RT-PCR screening of viral pathogens revealed hMPV. Clinical improvement was achieved a week after illness. This case represents severe hMPV pneumonia developed in an immunocompetent adult.