Infection-Associated Cancers Worldwide Certain infections raise the risk of cancer in specific organs. These infection-associated cancers account for a substantial share of cases globally. Viruses, bacteria, and parasites act as the main agents. Therefore, prevention of the underlying infection often reduces cancer risk later in life. Major Infectious Agents and Linked Cancers Human papillomavirus drives […]
Category: Infection
Staphylococcal Toxin-Mediated Disease Staphylococcus aureus can injure the host without invading every tissue. Several of its diseases are driven by secreted toxins. The bacteria may stay at a limited site. The toxin then travels and produces the clinical picture. Superantigens are central to toxic shock. TSST-1 and some enterotoxins link MHC class II to T-cell […]
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Influenza and Viral Pneumonias
Influenza and Viral Pneumonias Influenza is a seasonal respiratory virus. It attacks the airway lining. Most cases stay in the upper tract. Some spread into the lung and become pneumonia. Other viruses can do the same. Respiratory syncytial virus, SARS-CoV-2, adenovirus, and parainfluenza are common examples. Viral pneumonia means infection of the lung tissue by […]
How the E1-A226V Mutation Helped Chikungunya Spread Through Aedes albopictus Chikungunya virus usually rides Aedes aegypti. A single amino-acid change later improved its fit for another mosquito. That change is E1-A226V. It replaces alanine with valine at position 226 of the E1 envelope protein. E1 helps the virus fuse with a host cell. Fusion occurs […]
Vancomycin MIC Testing Methods for Staphylococcus aureus Laboratories measure vancomycin activity against Staphylococcus aureus with MIC tests. MIC means the lowest drug concentration that stops visible growth. Accurate results matter because vancomycin remains a key treatment for serious MRSA infections. Disk diffusion does not work well for this combination. Therefore, labs rely on MIC-based methods. […]
Pathology of Coal Workers’ Pneumoconiosis Coal workers’ pneumoconiosis is a chronic lung disease. It follows prolonged inhalation of coal mine dust. Pathologists also call the simple form anthracosis when pigment is present without much scarring. Progressive massive fibrosis marks the severe stage. Dust reaches the bronchioles and alveoli. Macrophages then engulf the particles. Some cells […]