Effects of vegetation on methylmercury concentrations and loads in a mercury contaminated floodplain.

The Yolo Bypass (YB) is a large flood conveyance system designed to protect the city of Sacramento, California, USA from flooding when the Sacramento River approaches flood stage. The Sacramento River watershed and YB are a source of methylmercury (MeHg) to downstream habitat as a result of historic mercury (Hg) and gold mining practices. In the dry season, the YB is extensively farmed and grazed.

Improved immunogenicity with high-dose seasonal influenza vaccine in HIV-infected persons: a single-center, parallel, randomized trial.

Background: HIV-infected persons have less robust antibody responses to influenza vaccines.

Objective: To compare the immunogenicity of high-dose influenza vaccine with that of standard dosing in HIV-positive participants.

Design: Randomized, double-blind, controlled trial.

Cryptosporidium and giardia recoveries in natural waters by using environmental protection agency method 1623.

Relatively few studies have examined recoveries from source waters by using Environmental Protection Agency method 1623 with organism spike doses that are environmentally realistic and at turbidity levels commonly found in surface waters. In this study, we evaluated the filtration capacities and recovery efficiencies of the Gelman Envirochek (standard filter) and the Gelman Envirochek high-volume (HV) sampling capsules under environmental conditions. We also examined the performance of method 1623 under ambient conditions with matrix spike experiments using 10 organisms/liter.