Asthma is one of the world's most common chronic diseases, affecting as many as 300 million people. It is estimated that by 2025 there could be an additional 100 million people with the disease. Nasal congestion can be a sign of severe asthma, which means that healthcare professionals should be extra vigilant when it comes to nasal complaints. Furthermore, more severe asthma appears to be more common than previously thought, reveals a study from the Sahlgrenska Academy's Krefting Research Centre. The number of people with asthma has increased sharply over the past few decades. It has been suggested that this is a result of decreased childhood exposure to microorganisms. In a paper that suggests a new strategy to prevent asthma, scientists at Children's Hospital Boston and their colleagues report that the influenza virus infection in young mice protected the mice as adults against the development of allergic asthma. Approximately 13 percent of parents turn to alternative therapies to treat their children's asthma, according to a new study from the Université de Montréal. People with multi-symptom asthma more often have night-time awakenings due to asthma-symptoms, a sign of severe asthma. Workplace asthma costs the UK at least £100 million a year, and may be as high as £135 million, reveals research published online in Thorax. Italian doctors warn asthma patients in an unusual turn of events of getting an attack just because of a Facebook update. The metallic particles in the smoke emitted by fireworks pose a health risk, particularly to people who suffer from asthma. As choking smoke from the Tesoro Golden Eagle refinery drifted eastward, health officials in the Bay Area advised people with asthma or breathing problems to stay indoors. Evidence suggesting that the risk of childhood asthma associated with prenatal paracetamol exposure may depend on antioxidant genes in the mother has been found by a team of UK scientists. Risk of asthmatic attack on US children is directly related to their low social economic status (SES) and exposure to pests.