Merck CEO Rob Davis on Q2 results: We continue to see phenomenal growth

Merck chairman and CEO Rob Davis joins 'Squawk Box' to discuss the company's quarterly earnings results, which reported second-quarter revenue that topped expectations on strong sales of its blockbuster cancer drug Keytruda and HPV vaccine Gardasil, but posted a quarterly loss due to its acquisition of the biotech company Prometheus Biosciences earlier this year.