Explain why omicron is more contagious and less threatening than delta variant ?

PICO question.Pico is a mnemonic used to help clarify a clinical question. It acts as a framework, asking you to think specifically about different aspects of what to investigate. As you build the PICO , make sure that you are clear and specific about what you are looking for. This helps you target the right evidence to use in practice.P: patient, problemI: InterventionC: comparisonO: outcomeMake sure to make a specific question. What type of patient are you lookink for?Are you using a specific test as your intervention, or broad group? If you are looking for better outcome, What examples of those outcomes?
I need to use reliable, factual and recognized as legitimate in the field.Thanks !!!