Viruses and bacteria are a common cause of infectious disease acquired indoors, since they can be easily transmitted, especially in crowded, poorly ventilated environments.
Viral transmission routes are diverse, and include direct contact with infected persons, indirect contact with contaminated surfaces, fecal-oral transmission droplet and airborne transmission.
Droplet transmission occurs when viruses travel on relatively large respiratory droplets that people sneeze, cough, or exhale during conversation or breathing (primary aerosolization). Aerosol droplets travel only short distances (1-2 meters) before settling on surfaces, where viruses can remain infectious for hours or even days. Virus survival on fomites is influenced by temperature, humidity, pH and exposure to ultraviolet light.
Viruses and Bacteria
Allergy is a chronic disease which comes as a strong reaction to foreign particles that enters the body or comes with contact with the skin. These particles are called allergens and they cause different kinds of allergies: pets, medicine, pollen, food, and respiratory allergies that caused from allergens like mold or house dust mite dung.
The prevalence of people that suffer from allergy increase every year 300M people suffers fromasthma , 200-250 M from them suffers from food allergy , 10% from the entire population suffers from medicine allergy, and 400M people suffers from respiratory allergy.
Allergy symptoms can occur in different forms and severity depending on the type of allergy and sensitivity, in a case of food allergy, the allergy breaks out when the immune system detects the "intruder" food, through the digestive system or in contact with the body. The reaction can be swelling of the infected place to the point of life-threatening.
In case of raspatory allergy , the allergy breaks out when the immune system detects the “intruder” , a protein, through the respiratory system, the reaction can be redness and itching eyes. Runny or stuffy nose, or even a seizure of shortness of breath, Breathing wheezing as an expression of asthma.
Prevalence of Asthma and Allergy Among Children
Prevalence of asthma and allergies among children has become an increasing problem in the last few decades. Asthma has become the most common chronic disease among children and is one of the major causes of hospitalization among those younger than 15 years of age As more people are sensitized to allergens, allergic diseases may increase in Europe in the coming years.
If the exposure to these allergies persists over hours or days, as is the case with allergic patients in the spring or patients who are allergic to and exposed to dust mites all year round, then we may develop chronic complications.
This situation in which the nasal cough develops shortness of breath and eyes scratching and hearing suddenly and reliably for many days or months has been described in previous centuries and earned the name HAY FEVER or "hay fever" and so is the allergic patient feels like a real fever. "The link between the allergens and the allergens will not only cause immediate and short-term reactions but to the area where the allergic reaction will occur, inflammatory cells will develop and develop instead of an inflammatory response." These reactions may cause the watery mucus to become mucous, the nose will be blocked, Eye and skin infections – dramatic atopic pilot ?? Asthmatic attack.
The mold we know is a type of yeast and the yeast belong to the family of fungi
In order to spread to more distant regions, the molds multiply by creating spores. Spores are airborne and can easily reach into the air which we use and breathe. To grow, the mold needs oxygen, moisture, and the supply of its essential nutrients.
Most types of molds do not trigger an allergic reaction, but some of the types of molds that trigger an allergic reaction are: Alternaria, Cladosporium, Aspergillus, and Penicillium.
House Dust Mite Allergy
House Dust mite is a parasite from the spider’s family, which lives indoors. Dust mites are a microscopic creature that can only be seen with a magnifying glass. It is nourished by dead skin scales and its secretions are a perennial allergenic source and a major cause of allergic rhinitis and allergic asthma.
Because the dust mites 'living conditions are very close to the living conditions of humans, it is very difficult to avoid exposure to them, and the dust mites' life cycle helps them survive.