The below websites may support you in explaining the Coronavirus to children: 

https://www.childrenscommissioner.gov.uk/wp-content/uploads/2020/03/cco-childrens-guide-to-coronavirus.pdf A simple guide from the children’s commissioner.

https://www.mentalhealth.org.uk/coronavirus/coping-coronavirus-guide-young-people Advice for coping with the Coronavirus suitable for upper KS2.

https://www.mentallyhealthyschools.org.uk/getting-started/coronavirus-and-mental-health/ A selection of mental health toolkits.  

https://interagencystandingcommittee.org/system/files/2020-04/My%20Hero%20is%20You%2C%20Storybook%20for%20Children%20on%20COVID-19.pdf A story book for younger children that explains the Coronavirus

https://www.mencap.org.uk/advice-and-support/coronavirus-covid-19/what-coronavirus-covid-19 A simple guide to the Coronavirus and good handwashing.