The Period of Infectivity of Venereal Disease

Contrasting views on the infectivity of gonorrhoea.

The Tween 80 Toxicity in Chicken Embryos and Effect on the Kinetics of Newcastle Disease Virus Replication

Background: Non-ionic surfactant, Tween-80 (TW80) is commonly used for drug delivery due to its effect on the cell membrane permeation. The change in permeability can also increase viral infectivity in cells. This study was undertaken to improve upon Newcastle disease virus (NDV) titer cultivated with embryonic chicken eggs. Methods: The toxicity of TW80 was investigated against chicken embryo...

Important Factors in the Control of Syphilis.

The fluctuations in 1958 and 1961 were due to serial infections caused by certain promiscuous persons before the detection of their disease. These small epidemics were encouraged by the fact that contact-tracing could not detect the infectious persons quickly enough. An example of the chain-like spread of infection is illustrated in the Figure (opposite), which shows that thirteen direct infect...

Evaluation of the effects of concentration, duration and temperature of incubation with Beta-Propiolactone on inactivation of cell-derived rabies virus

Introduction: During the production process of vaccines against viral diseases, virus inactivation plays a crucial role.  β-Propiolactone (BPL) is a compound that is frequently used for inactivation of viruses and production of the vaccines against viral diseases such as rabies. In this study, the effects of concentration of BPL as well as the duration and temperature of incubation with BPL on ...

An Investigation of the Legionella Pneumophila Infection in Pneumonic Patients in Three Different Infections Hospital Wards in Tehran

Legionella pneumophila is one of the causative agent of pneumonia in human being. In recent years many reports has been come from different parts of world regarding infectivity of this organism. This disease occurs almost because of contamination of air conditioning systems. For the purpose of assessment of the legionella pneumophila in pneumonic patients, 200 specimen from sputum and tracheo-b...