Live Christmas trees are one of the Christian traditions Christmas and New Year holidays. But it turns out that they can carry not only joy and the spirit of the holiday. Scientists have found that fungi are present on spruce trees, which easily multiply in warm home conditions and release a huge amount of spores. The spores in turn cause coughing, shortness of breath, insomnia, lethargy, even bronchitis and pneumonia. To protect yourself, you need to either wash and dry the spruce before bringing it into the house, or use an artificial tree