The Cloverdale Virus is Sarah's lab note 5 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission We Couldn't Take The Risk, so it can't be missed.
After the trip to Cloverdale, Sarah admits her research played a part in making the virus. She describes how a careless intern let it escape and that she killed Jim Moore. She now needs a live subject for her serum.
This is where Sarah owns her part in the outbreak.
Deacon's Alive???
Deacon's Alive??? is Sarah's lab note 1 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission A War We Can Win, so it can't be missed.
Riding With Deacon
Riding With Deacon is Sarah's lab note 4 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission Just Another Acquisition Form, so it can't be missed.
Sarah's Lab Notes
Sarah's Lab Notes are six personal research notes written by Sarah Whitaker. They are rewards for main story missions in Crater Lake, so you get them just by playing on.
Silicate
Silicate is Sarah's lab note 3 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission Afraid Of A Little Competition?, so it can't be missed.