Coronavirus Covid-19 Infectious Area Signs highlight High Risk No Entry Areas during the Covid-19 Pandemic. Signs are available in a wide range of sizes and materials and are suitable for long term outdoor use. Most popular sizes are 48″ x 48″, 24″ x 24″ and 16″ x 16″. Don’t see the sign or size you are looking for? You can call us on 025-31212 or email email@example.com to discuss your requirements.