If the foreman or any grand juror be unable or fail to attend after being sworn, another may be sworn in his stead. And when one grand juror has been discharged, another may, by order of the court, be summoned to attend at the same term.
W. Va. Code § 52-2-10
Substituting new juror to fill vacancy; summoning additional juror
Official source: West Virginia Legislature. Reproduced from public-domain West Virginia statutes; confirm against the official source for the current text. Not legal advice.