$QDEL is one of biggest losers #stocks today. read more:

Quidel Corporation (symbol: QDEL) was one of the worst losers of the
trading day today (2016-09-21), losing -4.5%. The number of shares that
changed hands was 329,476, or about 3 times the average daily volume in the
stock.
The closing price was $21.88, amounting to a market cap of $708,740,000,
about -8.6% off the highest price in the last 12 months. The stock has been
trading at a range between $13.21 and $23.94.
QDEL is in the Biotechnology: In Vitro & In Vivo Diagnostic Substances
industry, part of the Health Care sector.