Nesquik has started a voluntary recall for some containers of Nesquik powder sold in the US (10.9m 21.8 and 40.7 oz containers). It seems the calcium carbonate may have been contaminated with Salmonella.
Lookunder the can for the production code then compare it to the list found here. All affected products have an expiration date of October 2014. If you have a batch, return it to the store fore a replacement or refund. You can always reach Nestle support at +1 800 628-7679.