Pigs at the Minnesota state fair have tested positive for the H1N1 "swine" flu virus in preliminary tests.

Confirmation tests are pending, but this could be bad news and cause panic within the pork industry. Pork belly futures and companies like Smithfield Foods (NYSE: SFD), Tyson (NYSE: TSN), and Hormel (NYSE: HRL) are a few that could be affected.

BioCryst Pharmaceuticals (NASDAQ: BCRX) was on the move Tuesday after inking letters of intent with three partners, who will take the lead on stockpiling, marketing, and distribution efforts for the company's influenza treatment in four countries. Marketing and distribution will be contingent upon local regulatory approval, but all three partners will immediately begin discussing stockpiling opportunities with the appropriate government officials.

Moksha8 Pharmaceuticals will be BioCryst's representative in Brazil and Mexico, which together account for 75% of the Latin American pharmaceutical market. Meanwhile, NT Pharma Co. is the company's Chinese partner, and Neopharm Group is taking the reins in Israel.

Even though eating properly handled and cooked pork products is safe, some Americans and international consumers will still avoid pork, due to the H1N1 flu.

That would typically hurt protein food producers, but Tyson Foods (NYSE: TSN) has alternatives, namely chicken, which is a major reason I'm reiterating my Buy rating for Tyson Foods, first recommended on May 11, 2009, at a price of $12.35.

Pork producer Smithfield Foods (NYSE: SFD) confessed Tuesday morning to a first-quarter loss of $107.7 million, or 75 cents per share, notably worse than its year-ago loss of just $13.2 million, or 10 cents per share. Excluding one-time charges, SFD would have swallowed a loss of 56 cents per share for the recently concluded quarter. Revenue for the period fell by more than 13% to $2.72 billion.

Both figures fell short of analysts' expectations, which called for a loss of 53 cents per share on $2.82 billion in revenue. Thanks to the twin factors of the recession and the still-spreading H1N1 virus -- a.k.a. the "swine flu" -- Chief Executive Larry Pope said, "I feel like the world has been against us for 12 months." (While H1N1 cannot be contracted by consuming pork products, the pork industry has suffered nevertheless by association.)

Vical Inc. (NASDAQ: VICL) surged higher out of the gate Thursday after scoring a U.S. patent for its pandemic and seasonal influenza vaccines, including those to shield against H1N1 (swine flu) and H5N1 (avian flu). Both treatments use Vical's patented Vaxfectin adjuvant, which helps to boost immunity.

While the H5N1 vaccine has completed early-stage human trials, the H1N1 vaccine has yet to be tested on human subjects. Positive results have been recorded from tests conducted on mice and rabbits, but VICL said earlier this year that it will require more funding to begin large-scale trials on humans.

Bright and early this morning, Roche Group (OTC: RHHB) announced first-half earnings and upped its annual earnings goal, thanks to impressive sales of Tamiflu. Roche's first-half profit (it only reports earnings twice) dropped 29% to $3.8 billion as the company was hit by costs related to its purchase of Genentech. That said, Roche upped its earnings guidance and forecast double-digit core earnings growth in both 2009 and 2010 -- the earlier forecast called for earnings to stay at 2008 levels.

Visa (NYSE: V), whose colleagues include American Express (NYSE: AXP), MasterCard (NYSE: MA), and Discover Financial Services (NYSE: DFS), reported a Q2 profit on Wednesday that was surprisingly strong. On an adjusted basis, earnings came in at 73 cents per share. Analysts were banking on only 64 cents per share, according to Reuters.

Quite frankly, I can see the disparity between Wall Street's thinking and the ultimate reality. I mean, the economy has been bad (to state the obvious), and people aren't spending as much. This means that they aren't using their credit cards like they used to. Ergo, you might expect Visa to post a lower number.

Burger King (NYSE: BKC), a fast-food joint that competes with McDonald's (NYSE: MCD), Yum! Brands (NYSE: YUM), and Wendy's/Arby's Group (NYSE: WEN), issued its Q3 report on Wednesday. The top line didn't do much, rising only 1% in the face of difficulties with currency translations. Earnings came in at 34 cents per share. That was one penny better than Wall Street's expectations, according to Reuters.

It's always good to beat the earnings call. But Burger King didn't get much mileage out of that victory. The stock actually sold off 3% on the news, closing yesterday at a fresh 52-week low of $16.55. The big catalyst was the conservative fiscal-year guidance.

Several national chains are talking up demands for reduced retail rents at locations across the country, according to a post in BNET.

That can't be good news for strapped mall operators, such as Simon Property Group (NYS: SPG), which have recently seen their fortunes turn upwards on the backs of analyst upgrades and economists calling a bottom to the Great Recession.

Late Tuesday, Carnival Corporation (NYSE: CCL) reported that it will temporarily cancel all stops in Mexico due to fears surrounding the swine flu. "We have decided to cancel calls at Mexican ports for all current sailings. Additionally, we will cancel calls in Mexico for all voyages departing Thursday, April 30 through Monday, May 4," the cruise line operator said in a statement.

Carnival isn't the only cruise line playing it safe. Sector peer Royal Caribbean Cruises Ltd. (NYSE: RCL) also announced plans to temporarily suspend port calls in Mexico. Currently, the World Health Organization (WHO) has not recommended any travel restrictions to halt the swine flu's spread.