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| ENTERAL IMMUNIZATION AND CHALLENGE OF VOLUNTEERS GIVEN ENTEROTOXIGENIC ESCHERICHIA-COLI CFA/II ENCAPSULATED IN BIODEGRADABLE MICROSPHERES |
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| Author(s): TACKET CO, REID RH, BOEDEKER EC, LOSONSKY G, NATARO JP, BHAGAT H, EDELMAN R |
| Source: VACCINE Volume: 12 Issue: 14 Pages: 1270-1274 Published: NOV 1994 |
| Times Cited: 61 References: 22 |
| Abstract: The development of a safe and effective vaccine against enterotoxigenic Escherichia coli (ETEC) would be useful for travellers and for young children in endemic areas. A feasibility study of an enteral ETEC vaccine prototype consisting of colonization factor antigen II (CFA/II), containing two component antigens CS1 and CS3, encapsulated in biodegradable polymer microspheres (BPM) was conducted in healthy volunteers. Ten adult volunteers swallowed intestinal tubes on days 0, 7, 14 and 28; after collection of jejunal fluid samples, 1 mg of CFA/II in BPM was administered via the tube. Volunteers kept a diary of symptoms after each close. Secretory IgA in jejunal fluids, serum responses and circulating antibody-secreting cells (ASC) were measured before and after vaccination, The vaccine was well tolerated. Five of ten volunteers developed TgA anti-CFA/II ASC by 7 days after the last dose of vaccine; these same five vaccinees had IgA anti-CS3 ASC, and three of these five vaccinees had IgA anti-CSI ASC. Five of ten vaccinees developed rises in jejunal fluid sIgA anti-CFA/II with peak GMT of 1:42. About 8 weeks after the first dose of vaccine, ten vaccinees and ten unvaccinated control volunteers underwent challenge with 10(9) c.f.u. ETEC E24377A (0139:H28 LT(+) ST+ CS1(+) CS3 +). Ten of ten controls and seven of ten vaccinees developed diarrhoea (p = 0.11, 30% vaccine efficacy). Two of the three protected vaccinees had the highest numbers of ASC and highest sIgA titres during the course of immunization, suggesting that these responses were protective and that this vaccine development strategy has merit. Future studies with higher dosages and a different dosing schedule are planned. |
| Document Type: Article |
| Language: English |
| Reprint Address: TACKET, CO (reprint author), UNIV MARYLAND, SCH MED, DEPT MED, CTR VACCINE DEV, DIV GEOG MED, 10 S PINE ST, BALTIMORE, MD 21201 USA |
Addresses:
1. WALTER REED ARMY MED CTR, WALTER REED ARMY INST RES, WASHINGTON, DC 20012 USA
2. UNIV MARYLAND, SCH PHARM, BALTIMORE, MD 21201 USA |
| Publisher: BUTTERWORTH-HEINEMANN LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB |
| Subject Category: Immunology; Medicine, Research & Experimental; Veterinary Sciences |
| IDS Number: PL791 |
| ISSN: 0264-410X |
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