Among the limitations of this vaccine are potential virus escape from the production facility, short shelf life of formulated product, short duration of immunity and requirement of dozens of antigens to address viral antigenic diversity.
You don't want to encourage people to think that money can buy them immunity from the requirement to treat other people (including taxi drivers) with at least a modicum of respect.
Thus, although TH1 immunity is a requirement for resistance, its presence does not prevent disease in susceptible individuals.
This suggests that activating both arms of immunity is an important requirement to subvert immune-escape mechanisms against established and rapidly growing tumors such as the poorly immunogenic B16 melanoma.
The induction of long term immunity is a key requirement of any vaccine.
Under the Justice Department's corporate leniency policy, a corporation is entitled to amnesty or immunity if, among other requirements, it reports wrongdoing before the government learns of it, if it promptly sets things right and if it cooperates with investigators and makes restitution.
One other instance of adverse behaviour was examined separately – failing to comply with requirements around immunity status (mostly Hepatitis B).
What's more, players from around the globe may have varying levels of immunity, based on differing vaccination requirements abroad.
During a November hearing on the bill, Georgetown University Law School professor Adam Levitin criticized the bill as a set of unearned giveaways for small financial firms -- tax cuts, accounting gimmicks to hide losses, weaker capital requirements and even immunity from some forms of scrutiny by the Securities and Exchange Commission.
For colicin function, a trip bond meets the seemingly mutually exclusive requirements of providing long term protection to the host, yet permiting the facile dissociation of immunity protein that is required for cell invasion of bacterial competitors.
