Seroprevalence of anti-HAV total antibodies among workers in wastewater treatment plants.

Objectives: Data on high frequency of hepatitis A virus (HAV) antibodies for wastewater treatment staff is contradictory. Literature lacks data on the seroprevalence of antibodies to HAV (anti-HAV) among workers in wastewater treatment plants (WWTPs) in Bulgaria. The aim of this study is to establish a specific humoral immune response to hepatitis A virus - anti-HAV total antibodies among staff in WWTPs.

Improving traffic noise simulations using space syntax: preliminary results from two roadway systems.

Noise pollution is one of the four major pollutions in the world. In order to implement adequate strategies for noise control, assessment of traffic-generated noise is essential in city planning and management. The aim of this study was to determine whether space syntax could improve the predictive power of noise simulation.

The influence of air pollution during intrauterine development and early childhood on respiratory functions at later age.

Aim: The aim of this study is to estimate the influence of high levels of air pollution during intrauterine development and early childhood on the respiratory functions at a later stage in life.

Material And Methods: The subjects were children from Dimitrovgrad - one of the most industrialized areas in Bulgaria. The transition to market economy (after 1989) was accompanied by a great drop in industrial production and levels of air pollutants respectively.

Respiratory and cardiovascular functions among smoking and nonsmoking girls from two regions with different air pollution degree.

Aim: The aim of the present study was to analyze the respiratory and cardiovascular functions among smoking and nonsmoking girls attending two schools situated in regions with different levels of air pollution. The characteristic of air pollution is based on the data gathered by stations 1 and 2 belonging to the Uniform National System for Monitoring the Air Pollution in Bulgaria. The participants (n=108, 16.