But there has been little data about such strains in Africa or among H.I.V. patients, Dr. Gandhi said.
Such strains could send German bond yields much higher than Wednesday's offering.
Infections from such strains of bacteria are believed to cause thousands of deaths a year.
Such strains are a sign of things to come as success causes even more problems.
In fact, Levine said, rowing puts such strains on the heart that astronauts use rowing machines during space flights to try to maintain their cardiovascular fitness.
Some countries that believe they are free of MDR and XDR tuberculosis have prohibited shipment of such strains to prevent accidental spread.
The two countries where indigenous strains have been eliminated are Egypt and Niger; the four where such strains still exist are Nigeria, Afghanistan, India, and Pakistan.
Still, many experts, people in the industry among them, say that such strains are present and, without significant changes, are likely to keep rising.
Scientists worry that such strains, now unusual, could become more common, since viruses and bacteria often become invincible if they are frequently exposed to a drug.
"The Avenue of the Americas symbolizes a bond of social union which should long outlast such strains as those imposed by the current upheavals in Argentina and Venezuela".
Such strains can only increase the pressure towards a later law more clearly based on an absolutist notion of individual autonomy.
