Updated from 10:12 a.m. EDTWho would have predicted that biotech stocks would have had a boost from the swine flu scare? GlaxoSmithKline ( GSK), marketer of the Relenza flu drug, jumped 7.5% in one day. Roche, which makes Tamiflu, had a one-day increase of more than 10%. On Tuesday, BioCryst ( BCRX) closed up about 89% so far this week, and Novavax ( NVAX) closed up about 124% for the week, though both stocks closed in the red on Wednesday. The attention paid to these stocks has caused investors to take a closer look at health care companies in general. Surprisingly, many health care companies are heavily shorted, which creates some short squeeze opportunities. A short squeeze takes place when short-sellers quickly buy up shares of the stock in order to cover their positions, driving the price of stocks up sharply. The metric for measuring short-squeeze opportunities is the short ratio, which is the number of days it would take the short-sellers to cover their positions based on recent average daily volume. With this in mind, Stockpickr compiled a portfolio of the top health care short-squeeze plays, including Quest Diagnostics ( DGX). To read more, visit Stockpickr.com.