Resistance of <i>K. pneumoniae</i> strains to complement mediated lysis.

*<p>HTS = Heat treated sera. Serum complement factors were inactivated by heating at 56°C for 30 min.</p><p>Note: A bacteriostatic antibiotic - tetracycline (25 µg/ml) - was added to samples to inhibit growth and hence allow direct measurement of bacterial killing by complement factors.</p><p>Figures are the average of duplicate samples, and the assay has been repeated in the presence and absence of tetracycline.