Question: is this a 2) strong advice, 1) weak advice 0) no advice?

Moreover serological screening, of all HCSs, and administration of booster HBV vaccine doses when needed, are preventive policies particularly meaningful in the current period when foreign students coming from countries with potential gaps in the immunization programs or coverage rates could increase the reservoir of young susceptible workers exposed to biological risks. 
user
This is a weak advice
assistant