According to the Associated Press, Merck & Co. plans to invest about $100 million to expand its vaccine manufacturing facility in Durham if approved by county commissioners. The planned 115,000-square-foot expansion, which would create another 50 to 60 jobs, includes a sterile processing facility, testing labs and packaging areas, according to Gov. Mike Easley''s office. The pharmaceutical giant began constructing the facility in 2004, and expects it to be completed next year. The expansion project, contingent on a grant being considered by the Durham County Commission, would begin next year and be completed by 2010. Before the expansion, the company planned to employ as many as 200 workers at the 232,000-square-foot plant.