Scientists, public health experts, food producers and consumers have united to generate functional food research that allows the public to gain important knowledge on functional foods that will strengthen the immune system for combating viral diseases, new research findings relating to the virus and public health strategies to prevent the spread of the viruses. Please note, we do not accept returns of any books, unless the book is defective. If you received a damaged, defective, or incorrect item, you could request a replacement through Your Orders.