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Interestingly, the researchers found some of the samples were resistant to the antibiotic tetracycline and did not carry antibiotic resistance genes typically seen in today's antibiotic-resistant bacterial strains.

If the patient needs more therapeutic protein, then he/she would take more tetracycline to boost production.

The first is a phototoxic reaction, often seen with certain antibiotics such as tetracycline.

In France, where some of the studies were conducted, about 65 percent of infections are resistant to tetracyclines, a class of antibiotics that includes doxycycline.

Doxycycline, a relative of the antibiotic tetracycline, has been around for more than 45 years and is commonly used to treat and prevent acne and Lyme disease.