Low - Low levels of respiratory illness affecting a very small percentage of the population.
Low-Medium - Low-Medium levels of respiratory illness affecting a small percentage of the population.
Medium - Moderate levels of respiratory illness indicate that cold/flu symptoms are beginning to penetrate the market.
Medium-High - Medium-High levels of respiratory illness indicate that cold/flu symptoms are moving toward peak levels.
High - High levels of respiratory illness indicate that cold/flu symptoms may be at peak levels for the season.