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Common Human Diseases Caused By Helminths- Online Class 12 Biology ASCARIASIS :  This disease is caused by roundworm  Ascarislumbricoides . Infections have no symptoms in more than 85% of cases, especially if the number of worms is small. Symptoms increase with the number of worms present and may include shortness of breath and fever at the beginning of the disease. These may be followed by symptoms of abdominal swelling, abdominal pain, and diarrhoea.  Children who are 3 to 8 years old are most likely to be infected because of their contact with soil while playing in the soil; hence they suffer from poor weight gain, malnutrition, and learning problems. The source of infection  is from objects which have been contaminated with faecal matter containing eggs. Ingestion of infective eggs from soil contaminated with human faeces or contaminated vegetables and water is the primary route of infection. Infectious eggs may occur on other objects such as hands, money...