Abstract:
:We previously observed that a detoxified Escherichia coli O111, Rc chemotype J5 lipopolysaccharide (J5dLPS)/group B meningococcal outer membrane protein (OMP) vaccine protected animals from experimental lethal sepsis when immune antibodies were given passively as treatment at the onset of fever or when vaccine was given actively as prophylaxis. To test the safety and immunogenicity of this vaccine, we administered doses of 5, 10 and 25 microg (based on dLPS) of vaccine at days 0, 28 and 56 to 24 human subjects (8 per group). Temperatures of 100.3, 99.5 and 99.4 degrees F occurred in three subjects. At 24h, pain at the injection site was moderate in 38%, mild in 44% and not present in 18%, while at 48 h, it was 1, 25 and 73%, respectively. No alterations in baseline renal, hepatic or hematologic functions occurred. There were two to three times mean-fold increases in anti-J5dLPS IgG (range: 1.9-5.1) and IgM (range: 1.2-9.2) levels in subjects receiving the 10 and 25 microg doses. At 12-month follow-up, three of the original responders had continued elevation of antibody levels. A 25 microg booster dose of vaccine did not increase antibody levels among those responders and did not elicit antibodies among three subjects with no previous antibody response. The plasma from the six volunteers inhibited LPS-induced cytokine generation in human whole blood ex vivo. We conclude that this J5dLPS/OMP vaccine was safe and well-tolerated with transient, local pain at the injection site. Vaccine formulations with different adjuvants are currently under investigation.
journal_name
Vaccinejournal_title
Vaccineauthors
Cross AS,Opal SM,Palardy JE,Drabick JJ,Warren HS,Huber C,Cook P,Bhattacharjee AKdoi
10.1016/s0264-410x(03)00483-3subject
Has Abstractpub_date
2003-11-07 00:00:00pages
4576-87issue
31eissn
0264-410Xissn
1873-2518pii
S0264410X03004833journal_volume
21pub_type
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