Navigation Links
Inhaled tuberculosis vaccine more effective than traditional shot
Date:3/12/2008

CAMBRIDGE, Mass. -- A novel aerosol version of the most common tuberculosis (TB) vaccine, administered directly to the lungs as an oral mist, offers significantly better protection against the disease in experimental animals than a comparable dose of the traditional injected vaccine, researchers report this week in the Proceedings of the National Academy of Sciences.

The aerosol vaccine -- under development through a collaboration between Harvard University and the international not-for-profit Medicine in Need (MEND) -- could provide a low-cost, needle-free TB treatment that is highly stable at room temperature.

"Rising rates of tuberculosis and drug-resistant disease in developing countries have amply illustrated the need for more effective vaccines," says David Edwards, the Gordon McKay Professor of the Practice of Biomedical Engineering in Harvard's School of Engineering and Applied Sciences. "While most new TB vaccines continue to call for needle injection, our vaccine could provide safer, more consistent protection by eliminating these injections and the need for refrigerated storage. We see great promise for this new treatment."

Says Barry R. Bloom, dean of the Harvard School of Public Health: "Tuberculosis is one of the most resistant and challenging diseases to protect against, and the successful results of aerosol delivery using nanoparticle technology offers a potentially new platform for immunization. Were the animal results here confirmed in human studies, this technology could be used not only for TB vaccines, but those protecting against other infectious diseases as well."

The current PNAS paper by Edwards, Bloom, and colleagues at the University of North Carolina-Chapel Hill, the Aeras Global TB Vaccine Foundation, MEND South Africa, the Harvard School of Public Health and School of Engineering and Applied Sciences, and Manta is based on studies involving guinea pigs, a species of rodent highly sensitive to TB.

Among guinea pigs vaccinated with the aerosol treatment and subsequently exposed to TB, less than 1 percent of lung and spleen tissue showed effects of the disease. By contrast, in animals treated with the same dose of the traditional injected vaccine, some 5 percent of lung tissue and 10 percent of spleen tissue showed symptoms following TB exposure.

Administered to 100 million infants annually, the current Bacillus Calmette-Gurin (BCG) vaccine for TB is the world's most widely administered childhood vaccine. Dried into a powder by freezing and delivered by needle injection, the vaccine requires refrigerated storage and has shown variable degrees of protection against tuberculosis in different parts of the world. These limitations have prompted calls from public health experts and physicians for alternative treatments.

The rapid-drying process by which the aerosol vaccine is made resembles the technique used in the manufacture of powdered milk. In the aerosol vaccine, particles form at micrometer and nanometer scales and in spherical and elongated shapes, a combination that appears to improve dispersal in the mouth.

While commonly used with food, cosmetics, and pharmaceuticals, this spray drying of small and large molecules is seldom used for drying cellular material. The new technique enables TB vaccines, and potentially other bacterial and viral-based vaccines, to sidestep the traditional problems associated with keeping vaccines chilled.

"Spray drying is lower-cost than BCG, easily scalable for manufacturing, and ideal for needle-free use, such as via inhalation," says Edwards, an international leader in aerosol drug and vaccine delivery. "Its greater stability at room temperature could ultimately provide a better means of creating and delivering vaccine throughout the world."


'/>"/>

Contact: Steve Bradt
steve_bradt@harvard.edu
617-496-8070
Harvard University
Source:Eurekalert

Related medicine news :

1. New antibiotic drug combo to speed up treatment of tuberculosis
2. The Lilly MDR-TB Partnership Provides Unique Model for Fight Against Multidrug-Resistant Tuberculosis in South Africa
3. Conference on Elephant Tuberculosis Research Establishes Action Plan at International Symposium on Elephant Conservation
4. Most ancient case of tuberculosis found in 500,000-year-old human; points to modern health issues
5. Weill Cornell receives $2.4 million in grants from Gates Foundation to fight tuberculosis
6. Simple strategy could prevent half of deadly tuberculosis infections
7. Researcher, magnet lab receive $2 million grant to target tuberculosis
8. Research discovers new compounds active against tuberculosis and malaria
9. PhRMA Applauds House Committee on Foreign Affairs Commitment to Continuing Efforts to Fight AIDS, Tuberculosis, and Malaria Epidemics
10. A new more effective tuberculosis screening test for HIV victims
11. DNA vaccine against multiple sclerosis appears safe, potentially beneficial
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/27/2017)... , ... March 27, 2017 , ... Buzzies parent company, ... 10 for Rent the Runway Foundation and UBS’ Project Entrepreneur. Mayo will present her ... April 8. , Project Entrepreneur’s second annual venture competition ignites bold ideas by ...
(Date:3/27/2017)... (PRWEB) , ... March 27, 2017 , ... ... recently received the CE Certificate of Conformity for the Smart System® 20/20. CE ... exceed the highest industry standards and specifications such as ANSI, ISO and proven ...
(Date:3/27/2017)... ... March 27, 2017 , ... ... and conference coverage on veterinary medicine, announces the launch of Veterinarian’s Money Digest™, ... packaged with the April edition of American Veterinarian™. , “We look ...
(Date:3/27/2017)... ... March 27, 2017 , ... ... weight management program at Women’s Excellence will help patients lose weight and keep ... exam. The specialists at Women's Excellence will measure BMI, body fat composition, ...
(Date:3/27/2017)... (PRWEB) , ... March 27, 2017 , ... ... epigenetic research products enables researchers to pursue the recent RNA methylation “gold rush” ... . In light of the newfound characteristics of N6-methyladenosine, or m6A , ...
Breaking Medicine News(10 mins):
(Date:3/24/2017)... India , March 24, 2017 Abdominal Aortic Aneurysm Repair ... million by 2022, Globally, registering a CAGR of 5.1% from 2016 to 2022. The ... projected to dominate the market during the study period. ... ... ...
(Date:3/24/2017)... , March 24, 2017 New England Pediatric ... of an award including funding and in-kind service towards ... technology.  "Making blood draws less traumatic ... their whole hospital experience better.  We,re looking forward to ... can help improve care for the kids we treat," ...
(Date:3/24/2017)... 2017 Research and Markets has announced the addition ... Demand Forecast to 2022" report to their offering. ... The global wound care market was worth ... CAGR of 6.7% during 2016-2022 Among the various wound care ... in the global market in 2015. Among the various applications, surgical wound ...
Breaking Medicine Technology: