Subunit influenza vaccination in adults with asthma: effect on clinical state, airway reactivity, and antibody response.

The sick building syndrome is well known among office workers and is becoming more recognised among health workers.' It is therefore important to be able to give correct advice when faced with this problem. This study provides evidence that negative ion generators are not to be recommended for this problem, especially as the data on temperature and humidity provided a good "internal control" that real effects were being measured.