Olfactory host entry supports herpesvirus recombination

Herpesvirus genomes record abundant recombination. Its impact on infection remains ill-defined. When co-infecting mice by the natural olfactory route, individually incapacitated Murid Herpesvirus-4 (MuHV-4) mutants routinely recombined to restore normal host colonization. Lung infection rescued much less well. Murine cytomegalovirus mutants deficient in salivary gland colonization also showed rescue via the nose but not the lungs. As nose and lung infections show similar spread, efficient recombination seemed specific to olfactory entry. Rescue of replication-deficient MuHV-4 implied co-infection of the first encountered cells, and this worked also with asynchronous inoculation, suggesting that latent virus could lie in wait for later reactivation. Inhaled MuHV-4 is commonly caught on respiratory mucus, which epithelial cilia push back towards the olfactory surface, and infection was correspondingly frequent at the anterior olfactory edge. Thus olfactory entry provides a general means for herpesviruses to meet.Author summaryInter-strain recombination allows viruses to optimise infection in diverse hosts. Many herpesviruses show past recombination. Yet they are ancient pathogens, so this past may be remote and recombination rare. Diverse herpesviruses enter new hosts via olfactory cells. We show that such entry routinely allows recombination between co-infecting virus strains, even when one strain cannot spread. Recombination was contrastingly rare after lung infection. Thus, entry via olfactory cells specifically supports frequent herpesvirus recombination.

The Role Of Rose (Rapid Onsite Evaluation) On Spinal Lesion Surgery Decision

Introduction: Exposure and instrumentation of the spine must be meticulous and thorough regardless the techniques and approach selected. Management of the whole surgery process should be decided based on the best available evidence whenever possible. ROSE (Rapid Onsite Evaluation) cytology wrap up the surgical decision. Case Description: Fifteen cases comprise of lytic lesions and/or single pathological fractures of the corpus vertebrae will be presented and discuss as to how the surgical techniques and approaches are assisted by ROSE. ROSE cytology was performed in the operating theater during the surgery. Samples were taken after exposure of the minimal lesion using (18–21) G trocar needle or under fluoroscopy guided. Direct smear, air dried fixation, and Diff Quik staining would take about 10 minutes. Pathologist evaluated the specimen and provided the result in about 20 minutes. The overall 30 minutes allowed surgeon to prepare the further steps. Results would be malignant or benign without pursuing further detail diagnostic. Benign results should be categorized as infection, suspicious of granulomatic tuberculosis, or normal host population cells. The cases outcome were 8 normal host population cells advanced for vertebroplasty to fill the porotic bone. Three spondylitis tuberculosis were debrided without unnecessary instrumentation, and four malignant processes were assured to have enough samples for immunohistochemistry evaluation afterward. All ROSE cytology was confirmed accordingly by the histopathology result afterward. Conclusion: ROSE is easy and offers accurate sampling from the lesion itself. It is quick, therefore during surgery surgeon could decide the best management for the patient.

Mechanical States of Repaired Full-Thickness Defects of Articular Cartilage by Tissue Engineering under Compression

It is difficult to repair the damage cartilage by itself when cartilage is injured. Cartilage tissue engineering is an ideal treatment method to repair cartilage defects, but at present, the repair has some uncertain effects which is caused by the mechanical states of the repaired region. Under the compression, mechanical behaviors of the repaired full-thickness defect were analyzed by means of the digital correlation technology. Experiments show that in the direction of vertical cartilage surface, the maximum compressive strain of artificial cartilage is 1.7 times higher than the normal host cartilage at 5.1% compression, and it is 1.4 times higher than the normal host cartilage at 25.6% compression. In parallel to the cartilage surface direction, the interface appears compressive strain and the host cartilage near the interface presents a smaller tensile strain. In the aspect of shear strain, direction of shear strain at the junction changes to the opposite direction with the compressive increase.