The influenza vaccine is unusual in that most years a different vaccine is made. Because strains of influenza virus that circulate in the community can differ from one season to the next, the vaccine must change to best protect against those different strains.
In VMware, switches are used to establish a connection between the virtual network and the physical network. With ESX and ESXi, two different kinds of switches can be used: standard switches and distributed switches.
You can't configure the same pool on both switches because the switches don't communicate so they could hand out the same addresses. What you can do is configure half the pool on one switch and the other half on the the other switch. If you choose a big enough pool then half the pool should be enough for all your clients. ON each switch you would need to exclude the IP's used on the other switch eg. DHCP pool 192.168.5.0/24. on switch 1.