Wiktionary
titres
n. (plural of titre English)
Usage examples of "titres".
Being now arrived at the proper age for producing themselves, they came up to town, and fell in love with the ladies, but especially three, who about that time were in chief reputation: the Duchess d'Argent, Madame de Grands Titres, and the Countess d'Orgueil.
It's not a virus, because antibody titres don't go up, and white-cell differentials don't change.