This dataset includes microscopy images from paraffin embedding hematoxylin and eosin (H&E) as well as immunohistochemistry (IHC) staining for cleaved caspase-3, CD3 and CD11b. For these experiments, 6-8 week-old male and female mice from WT, Mavs+/- and Mavs-/- background were infected with 1E5 PFU of chikungunya virus (CHIKV), or mock-infected with heat-inactivated inoculum or PBS. Cardiac tissue was extracted at the indicated timepoints, fixed in formalin for 72 hours, paraffin embedded and sectioned at different levels to obtained four chamber view representation, as well as representation of the vessels attached to the base of the heart.

The dataset is divided into sections. Each folder contains (i) description; (ii) a readme.xlsx file with all experimental details, and (iii) comments. Each file contains a Key-Value Pairs tab that contains all relevant information about each sample. The sections include:

• Section #1: Cleaved caspase 3 staining for WT-infected and mock-infected mice (intravenous), related to figure 2. Description: Mock-control (n=3), 3 dpi (n=3), and 5 dpi (n=3).
• Section #2-1: Cleaved caspase 3 staining for Ifnar1-/- and for WT-infected mice (intravenous) at 1 dpi, related to figure 3. Description: Mock-control (n=2), Ifnar1-/- (n=3), and WT (n=3).
• Section #2-2: Cleaved caspase 3 staining for Ifnar1-/- and for WT-infected mice (intravenous) at 1 dpi, related to figure 3. Description: Mock-control (n=2), Ifnar1-/- (n=3), and WT (n=2).
• Section #3-1_HE: Contains H&E from WT mice infected intravenously and harvested at 3 dpi. Related with Supplementary Data 1.
• Section #3-2_HE: Contains H&E from WT mice infected intravenously and harvested at 5 dpi and 10 dpi. Related with Supplementary Data 1.
• Section#4-1_HE: Contains H&E from Mavs-/- mice infected subcutaneous or intravenously and harvested at 14 dpi. Related with Supplementary Data 1, and Figure 5, 6 and Supplementary Figure 6 and 7.
• Section #4-1_CD3_CD11b: Contains IHC against CD3 and CD11b from Mavs-/- mice infected subcutaneous or intravenously and harvested at 14 dpi. Related with Supplementary Data 1, and Figure 5, 6 and Supplementary Figure 6 and 7.
• Section #4-3_HE: Contains H&E from Mavs-/- mice infected subcutaneously and harvested at 60 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Section #4-3_CD3_CD11b: Contains IHC against CD3 and CD11b from Mavs-/- mice infected subcutaneously and harvested at 60 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Sectioni #4-4_HE: Contains H&E from Mavs-/- mice infected intravenously and harvested at 60 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Section #4-5_HE: Contains H&E from Mavs-/- mice infected intravenously and harvested at 30 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Section #4-5_CD3_CD11b: Contains IHC against CD3 and CD11b from Mavs-/- mice infected intravenously and harvested at 30 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Section #4-6_HE: Contains H&E from Mavs-/- mice infected intravenously and harvested at 30 dpi (Samples #2, #3, and #4). In addition, it contains H&E from Mavs-/- mice infected intravenously that succumbed to the infection at 15 dpi (#1). Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6, and Supplementary Figure 7.
• Section#4-6_CD3_CD11b: dataset contains IHC against CD3 and CD11b from Mavs-/- mice infected intravenously and harvested at 30 dpi (Samples #2, #3, and #4). In addition, it contains IHC against CD3 and CD11b from Mavs-/- mice infected intravenously that succumbed to the infection at 15 dpi (#1). Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6, and Supplementary Figure 7.
• Section #4-6_Trichrome: contains Trichrome staining from Mavs-/- mice infected intravenously and harvested at 30 dpi (Samples #2, #3, and #4). In addition, it contains Trichrome staining from Mavs-/- mice infected intravenously that succumbed to the infection at 15 dpi (#1). Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6, and Supplementary Figure 7.
• Section #4-7_HE: contains H&E from Mavs-/- mice infected intravenously and harvested at 15 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Section #4-7_CD3_CD11b: Contains IHC against CD3 and CD11b from Mavs-/- mice infected intravenously and harvested at 15 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Section #4-8_HE: Contains H&E from Mavs-/- and WT mice infected intravenously and harvested at 10 dpi or 15 dpi. Related with Supplementary Data 1, and Figure 6 and Supplementary Figure 6.
• Section #4-9_HE: Contains H&E from Mavs-/-, Mavs-/+ and WT mice infected intravenously and harvested at 10 dpi. This dataset contained upper half sections of hearts in four chamber view orientation. This dataset includes myocardium, atrium and large vessels attached to the base of the heart. Each slide contains sections organized as follows: L1-sample1, L1-sample2, L2-sample1, L2-sample2. Related with Supplementary Data 1, and Figure 5.