CBSE Class 9 - Health and Disease Videos

• differentiate between Vaccination and immunization
• chronic disease
• what are the common methods of transmission of diseases  
• Which of the following disease have a long term effect? a)tooth infection b)intestinal infection c)chickenpox
• suggest any three steps that you will understand to maintain environment of hygiene
• What is virus  
• A healthy person can be disease free but a disease free person can't be a healthy person why ??
• what is immunizations?
• what is immunizations?
• what is defficiency disease   

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