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A. Fill in the blanks with suitable words. 1. Disease caused due to rubella virus is called 2. The disease-causing microorganisms are called 3. provides immunity through introduction of weakened or killed pathogen. 4. Insects and flies that are responsible for transfer of pathogen are called 5. Spread of disease by sneezing and coughing is described as infection. 6. Immune system acts by producing special proteins, called E​