Methods for detecting viruses are provided. A plurality of particles, each
of which is coated with a capture agent having an affinity for the virus,
is combined with the sample to form a plurality of analyte-particle
complexes. The system also includes a transport arrangement for
transporting the sample to the sensor surface, and optionally a magnetic
field inducing structure constructed and arranged to establish a magnetic
field at and adjacent to the sensor surface. The resonant sensor produces
a signal corresponding to an amount of analyte-particle complexes that
are bound to the sensor surface.