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Novel PET Tracer Identifies Majority of Bacterial Infections

By MedImaging International staff writers
Posted on 18 Oct 2017
Image: A 6\"-18F-fluoromaltotriose can detect viable E. coli bacteria one hour of implantation (Photo courtesy of Stanford University).
Image: A 6\"-18F-fluoromaltotriose can detect viable E. coli bacteria one hour of implantation (Photo courtesy of Stanford University).
A new positron emission tomography (PET) imaging agent offers a non-invasive method of detecting infection and monitoring antibiotic therapy.

Developed by researchers at Stanford University School of Medicine (CA, USA) and Thermo Fisher Scientific (Hanover Park, IL, USA), the new PET tracer is a derivative of maltose labeled with radioactive fluorine-18 (18F). The researchers conducted several studies in relevant bacterial strains in cultures and in living mice, and found that the tracer, dubbed 6"-18F-fluoromaltotriose, appears to be specific to bacterial infections, targeting a maltodextrin transporter expressed in both gram-positive and gram-negative strains of bacteria.

The researchers found that 6″-18F-fluoromaltotriose was also able to detect Pseudomonas aeruginosa in a clinically relevant mouse model of wound infection. In a rat model, the new agent was able to identify small bacterial foci in a heart valve. When the same rats were treated with an antibiotic, the PET signal from the cardiac tissue disappeared. According to the researchers, the properties of the tracer include sensitivity, specificity, and low background signal, which will facilitate its translation into humans. The study was published in the October 2017 issue of The Journal of Nuclear Medicine.

“We really lack tools in the clinic to be able to visualize bacterial infections. What we need is something that bacteria eat that your cells, so-called mammalian cells, do not,” said senior author Sanjiv Sam Gambhir, MD, PhD, chair of the radiology department at Stanford University School of Medicine. “As it turns out, there is such an agent, and that agent is maltose, which is taken up only by bacteria because they have a transporter, called a maltodextrine transporter, on their cell wall that is able to take up maltose and small derivatives of maltose.”

“The hope is that in the future when someone has a potential infection, this approach of injecting the patient with fluoromaltotriose and imaging them in a PET scanner will allow localization of the signal and, therefore, the bacteria,” concluded Dr. Gambhir. “And then, as one treats them, one can verify that the treatment is actually working; so that if it's not working, one can quickly change to a different treatment, for example, a different antibiotic.”

18F is a fluorine radioisotope that decays by positron emission 97% of the time, and electron capture 3% of the time; both modes of decay yield stable oxygen-18 (18O). 18F is an important radioisotope as a result of both its short half-life and the emission of positrons when decaying. It is primarily synthesized into fluorodeoxyglucose (FDG) for use in PET scans for cancer detection.

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92 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (67.949295043945): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (24.080276489258): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (85.115432739258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
105 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
106 (60.796737670898): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294771160 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (55.074691772461): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294771160 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 4091.0243988037): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
109 (115.87142944336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
110 (75.817108154297): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294771160 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (507.11631774902): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294771160 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (651.12113952637): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (430.10711669922): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
115 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
116 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
117 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
118 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
119 (38.862228393555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
120 (245.09429931641): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 36080.121994019): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
122 (91.791152954102): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
123 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
124 (!!!!! 6708.1451416016): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294771160 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294771160 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 1071793.0793762): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (!!!!! 635070.08552551): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (163.07830810547): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
128 (222.92137145996): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (180.00602722168): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
130 (53.882598876953): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (51.021575927734): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
132 (37.908554077148): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (!!!!! 1456.9759368896): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (!!!!! 2295.0172424316): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (658.98895263672): SELECT name FROM jos_deeppockets WHERE id=215
136 (123.02398681641): SELECT name FROM jos_deeppockets WHERE id=215
137 (800.13275146484): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (880.95664978027): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (!!!!! 2086.877822876): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
140 (368.11828613281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
141 (!!!!! 12961.149215698): TRUNCATE TABLE jos_trademed_module
142 (539.06440734863): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294771160 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (!!!!! 1900.9113311768): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294771160 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (!!!!! 4673.957824707): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
147 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
148 (!!!!! 1099.1096496582): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
149 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
150 (44.822692871094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
151 (!!!!! 1288.890838623): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294771160 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294771160 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (248.90899658203): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=215 or channel_id is null)
153 (83.92333984375): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=215 or channel_id is null)
154 (117.06352233887): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (192.16537475586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
156 (325.91819763184): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294771160 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294771160 AND published='1' LIMIT 1
157 (54.121017456055): select jos_twitters.link from jos_twitters where cat=10
158 (30.994415283203): select jos_facebook.link from jos_facebook where cat=10
159 (31.948089599609): select jos_google_plus.link from jos_google_plus where cat=10
160 (254.15420532227): select jos_linkedin.link from jos_linkedin where cat=10
161 (740.05126953125): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 2801.8951416016): insert into jos_banners_delta values (14615,'2025-06-20 18:52:53','216.73.216.120','view'),(14202,'2025-06-20 18:52:53','216.73.216.120','view'),(14203,'2025-06-20 18:52:53','216.73.216.120','view')