For LNB, other laboratory tests are available, such as leukocyte count, intrathecal antibody production, or intrathecal CXCL- 13 concentration, to support the presence of an infection in the central nervous system or other inflammatory conditions 156. overnight 4u order doxycycline online The authors have adjusted for propensity to prescribe and for baseline severity of symptoms in this analysis but cannot rule out residual confounding.