Throughout his career, Johnson has contributed to understanding of infections of the central nervous system.

In young, healthy people an infection of the lower respiratory system by a virus or bacteria may cause pleurisy.

Could someone being treated for pneumonia actually have an infection of the central nervous system?

A person who has an infection or disease of the respiratory system may cough up sputum.

In this population, death usually results from overwhelming liver failure or myocarditis, rather than infection of the central nervous system.

Most babies and older children have several mild infections of the respiratory system each year.

Tuberculosis is a less common bacterial infection of the lower respiratory system.

It was easy to trace the exact extent of his infection of the system.

Cytotoxicity within these macrophages can lead to infection and disease of the respiratory system.

This can look very similar to an infection of the urinary system.