The Influenza A virus subtypes that have been confirmed in humans, ordered by the number of known human pandemic deaths, are: 1  H1N1 caused Spanish Flu and the 2009 swine flu outbreak (novel H1N1) 2  H2N2 caused Asian Flu. 3  H3N2 caused Hong Kong Flu. 4  H5N1 is bird flu, endemic in avians. 5  H7N7 has unusual zoonotic potential.
Plug seal capsfeature one-piece linerless construction and. are designed for use in closed systems, providing a liquid-. and gas-tight seal. When loosened, this cap can also be used. in open systems. This cap design was a Corning innovation. that first appeared in 1974.
A punctal plug is a very tiny, bio-compatible device that is inserted into the tear ducts to block drainage. Once inserted into the tear ducts, punctal plugs increase the eyeâs tear film and surface moisture to relieve dry eyes. No larger than a grain of rice, punctal plugs are also known as; punctum plugs, occluders, and lacrimal plugs. There are two types of punctal plugs: semi-permanent and dissolvable. Semi-permanent punctal plugs are typically made of long-lasting materials such as silicone; whereas dissolvable plugs are made of materials that eventually absorb such as collagen, and usually last from a few days to several months.