The phrase "as a protective level" is correct and usable in written English.
It can be used when discussing measures or strategies that provide a safeguard or defense against potential risks or threats.
Example: "The company implemented new security protocols as a protective level against cyber attacks."
Alternatives: "as a safety measure" or "as a safeguard".
This is of great concern as such a high percentage without a protective level of anti-diphtheria antibodies creates an epidemic potential.
As immunity to the initially dominant variant is acquired, continued parasite survival depends on the ability to switch away from this variant, and switching back to the originally expressed variant will be unsuccessful as long as protective levels of antibody with specificity for this variant persist.
Studies of an inactivated HAV vaccine, VAQTA, have used anti-HAV concentration of 10 mIU/mL as protective level.
Cells respond to nutrition deprivation and to oxidative stress by inducing autophagy as a protective mechanism although the level of induction is not sufficient to maintain the survival of the cells.
Reference concentrations from the WHO were used as criteria values and the protective level of anti-HBs was defined as ≥10 mIU/mL [ 3].
A national household survey conducted in South Africa reported higher education level as a protective factor for respiratory diseases [ 41].
In contrast, while parasite numbers increase in resistant mice strains (such as C57BL/6) during early stages of infection, numbers subsequently plateau and eventually are reduced to a low level as a protective host immune response develops.
Other studies by Huisman et al. in 2005 and Gilmore et al. in 2000 [ 51, 52] reported higher income level as a protective factor for smoking while Aekplakorn et al. (2008) [ 38], Cho et al. (2008) [ 47], Lim et al. in 2010 [ 39].
Prospective studies showed positive association between total cholesterol (TC) levels and both BC incidence [ 24- 26] and increased overall mortality in BC patients [ 27]; but also no association at all [ 28- 33] or even inverse associations between TC levels and incidence of premenopausal BC [ 34- 36]; as well as a protective effect of very high levels of TC [ 37].
It is challenging to identify a protective serum level as palivizumab is used prophylactically and the RSV inoculum varies considerably among subjects.
