Which assessment finding is expected in a client with suspected inhaled anthrax?

Inhaled anthrax, caused by Bacillus anthracis spores entering the lungs, is associated with specific symptoms. The expected assessment finding is the abrupt onset of dyspnea and fever. This presentation results from the severe inflammatory response and pathogenic effects on the respiratory system after exposure to the spores.

When anthrax spores are inhaled, they can lead to a rapid progression of severe illness, often starting with flu-like symptoms that escalate quickly. The sudden emergence of dyspnea indicates respiratory distress, while fever reflects the body's systemic inflammatory response to the infection.

The other options mention skin findings or general fatigue, which are not typical characteristics associated with inhaled anthrax. For instance, a small papule on the skin is more indicative of cutaneous anthrax, where the spores enter through damaged skin. Pustular vesicles would be associated with specific cutaneous infections or variola, and vague fatigue does not capture the acute and serious nature of inhaled anthrax, which demands immediate medical attention. Thus, the abrupt onset of dyspnea and fever is the most concerning and expected finding in this scenario.