The 1973 Topps Wacky Packages Series 1 "Lavirus" spoof card/sticker (tan back) is a highly sought-after collectible, as it's 1 of 4 short-print stickers from the 1st series. Lavirus was derived from the brand name mouthwash called Lavoris, which had an 85-year rich heritage as the cinnamon mouthwash widely used by dentists. 

However, sales over the decades leading up to the end of the millennium began to decline when advertising support waned and brands like Scope and Listerine entered the market. Today, Lavoris has effectively been discontinued in retail stores. As a short-print (SP) sticker, "Lavirus" is a relatively rare item for collectors looking to complete series #1 of the '70s "WP" franchise. The 1st series entered stores in 1973 and was followed by several additional series throughout the decade.