"If you want to buy a great company dirt cheap, think Biogen Idec (NASDAQ: BIIB)," says biotech expert Michael Shulman. Here's an update from ChangeWave Biotech Investor.

"Biogen recently got hammered on 'bad' news that wasn't actually so bad. BIIB and partner Elan (NYSE: ELN) reported that two MS patients, out of 31,800 currently receiving Tysabri, developed a rare brain malady called PML.

"It's important to note, here, that the two companies had predicted that one in 1000 cases could develop PML and the FDA let the drug come to market with this understanding with a strong set of patient warnings and physician follow up.

"Tysabri has succeeded in the marketplace because it is a superior treatment for MS -- and the patients who use it agree, despite its high cost of $30,000 per year. I expect only a very small drop off in market acceptance for Tysabri and when it becomes apparent the drug is still desired by patients and doctors, the stock should rebound significantly.

"BIIB is still targeting 100,000 patients by 2010 and that would translate into $1 billion per quarter in sales.The two cases of PML cut the stock by almost 30% -- and that's ridiculous. It's simply too big a move for a cash-rich, risk-free company with several major drugs -- especially Rituxan which is taking more market share every quarter.

"Biogen Idec also has the ability to add new products through licensing or direct acquisition, and I expect it to do so in the coming quarters. This temporary downturn is a godsend for investors! BIIB is now selling well below the valuations of other large-cap, double-digit biotech growers. Take advantage of this mistake before the Street wakes up."

Steven Halpern's TheStockAdvisors.com offers a daily look at the latest market commentary and favorite stock picks and investment ideas from the nation's leading financial newsletter advisors.