Last week I wrote about Bay Area firms adding healthcare clients to diversify their portfolios in case of a downturn. But I wondered - do agencies that focus exclusively on healthcare have an advantage over firms that are now trying to beef up their healthcare clients? I asked Jim Weiss, CEO of WeissComm Partners - a San Francisco-based agency that practices only healthcare PR. He said his agency has hired 22 people in its San Francisco office in the last year and continues to grow. "I do not think it’s only because we specialize in healthcare," he said. "Though I do believe our singular focus has been critical to keeping our eye on the ball."